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#101 Re: Life on Mars » Mars: Very Long, Bitter Freeze » 2005-07-25 23:54:05

There have been countless reports about possible Martian histories, most of which disagree with many of the others. It's apparent to me that our current understanding of Mars is akin to a graph with just two or three known points - from these points, it's impossible to detect a trend or derive much useful information about the shape of the curve.

- Some reports are adamant that Mars is geologically dead and has been so for maybe 2 or 3 billion years. Other reports indicate probable major lava flows in the past 10 million years.
- Some investigations suggest strogly that Mars once had enormous quantities of water, which flowed in rivers and streams and vast outflow channels into a planet-girdling northern ocean. Yet, spectroscopic information from the surface shows substantial deposits of olivine scattered all over the Martian surface, olivine being a mineral which rapidly breaks down in contact with moisture or even ice.
- Crater counting has given us tentative dating for many different Martian surfaces, based on our understanding of lunar and terrestrial cratering epochs. But even that, on Mars, has been questioned and we may actually be at sixes and sevens when it comes to how old anything on the Martian surface actually is!

    This report about a long-frozen Red Planet is just one more set of data which contradicts other work about Mars. Obviously, it's good that new information is being compiled all the time, however confusing it may appear. And I'm sure that, one fine day, we'll arrive at a reasonably complete picture of how Mars evolved.
    But I think it'll be a good while before that day dawns and I very much doubt I'll be around long enough to enjoy it!  lol

#102 Re: Unmanned probes » Mars Exploration Rovers (MER) » 2005-07-19 17:42:51

Can't wait to hear Dr. Squyres' interpretation of the low-iron bedrock Spirit's been investigating. I love a good mystery.  smile

#103 Re: Unmanned probes » Mars Express (MEX) - ESA orbiter » 2005-07-19 17:36:53

I'm a bit slow to comment on this ESA image, Cindy, but I agree with you entirely that this is a "*Va-va-va-VOOM!  Spec-tacular" picture.
    The gullies all over that mound just shout "Water erosion!", at least to me.  smile
    But then, I'm no geologist.

#104 Re: Not So Free Chat » Political Potpourri VII - The Seventh Seal? » 2005-07-18 17:51:08

Here's an article from today's "The Australian" newspaper, which illustrates the kind of problem I've mentioned that exists within Islam - Crackdown]http://www.theaustralian.news.com.au/common/story_page/0,5744,15976086%255E601,00.html]"Crackdown on terror books".

    For those with too little time to read the whole thing, here are a few sentences:-

Federal and state counter-terrorism officers will investigate at least one Islamic bookshop in Sydney following revelations it is selling literature promoting jihad and justifying suicide bombings.

Another bookstore in Melbourne, run by the country's most fundamentalist cleric, was yesterday selling a book calling for Christians to be trampled underfoot.

"It is either Islam or death," says the book, which is sold from the bookshop attached to the Brunswick prayer room where Sheik Mohammed Omran delivers his fiery sermons.

The latest glossy magazine, from a group called Islamic Youth Movement in Sydney, features a glowing interview with a leader of Iraqi terrorist group Ansar al-Islam.

Fundamentalist scholar Sheik Omran's shop sells a book that details reasons Muslims should not befriend Jews, Christians or non-Muslims. "If it becomes clear that someone is at odds with Islam, then fight him. The (Jew or Christian) who insults the Prophet should be killed," it says. Sheik Omran's website also praises a US scholar convicted last week for inciting his young followers to wage war. The website paints the influential scholar, Ali-al-Timimi, as a victim of spurious charges.

    Weeding out these rogue Imams may not totally prevent acts of terror in our streets, but not weeding them out is unconscionable! We can't carry on turning a blind eye to this sort of thing for fear of upsetting the Muslim populations in our respective countries. Clerics like these must be rounded up and prosecuted to the full extent of the law.
    If a blond blue-eyed caucasian with a German accent stood up in public, with a swastika on his arm, and suggested violence against Jews, the left-wing rent-a-crowd protesters would be jamming the streets demanding action.
    Why is the Left soft-pedalling on this equally fascistic extremist-Islamic problem? (I think I know why and I think others do, too.)
    In fact, why are we all being so blase?!   ???

#105 Re: Not So Free Chat » Political Potpourri VII - The Seventh Seal? » 2005-07-17 21:23:03

Clark:-

... yet we end up with a handful of attacks that are supposed to represent a threat to our way of life. It just isn't so.

    Hmmm.
    If you look at what I said, you'll find I stated quite clearly my opinion that the terrorists will never succeed in changing the West to suit their religious views. That was the point of my argument. Their cause is not connected to any rational or attainable goals. In that sense, you're right; our way of life, ultimately, is not threatened.

    In another sense, though, there are some people who regard having trains and buses blown out from under them in rush-hour traffic as a threat to their way of life. Probably because their way of life involves travelling to and from work each day on public transport.
    These same people, whose views I tend to sympathize with, look at being incinerated in an explosion while holidaying in a place like Bali, or having the architecture in their cities suddenly and explosively rearranged by means of passenger planes used as battering rams, and think of these things as somehow threatening - at least on a local scale.
    And I think they have a point.

Clark:-

We are not waging a war against Islam, but it is turning out to be a war against Islam, and views expressed liek your own do not help.

    You're right that we're not waging a war against Islam as a whole and you may well be right that it is, or could be, turning out that way.
    But the reason it could turn out that way doesn't lie with individuals like me expressing the view that the extremists are irrational, which they are. The reason lies within Islam, where the clerics are failing to present a united front against the 'bad seed' in their midst. If every Imam declared loudly that suicide bombers are not martyrs, that killing themselves and the innocent people around them is condemned in the Koran and is a sin against God (which is the case, apparently), the murder and mayhem would almost certainly stop.
    This indicates to me that the fault lies not just with a few mixed-up savages on a mindless killing spree for no obvious reason, it shows there's something rotten within some echelons of the hierarchy of Islam.

    Clark, you may follow Bill's lead in thinking prudence is sometimes more important than morality. And I concede there is, regrettably, a place for such pragmatism in the real world.
    But where we have prominent Muslim clerics effectively encouraging terror and murder from the pulpit, or at the very least not condemning such atrocities unconditionally (and this is happening here in Australia), then I think the time for pussy-footing is over.
    We need to make it clear to such clerics that the freedom of speech they enjoy here in the 'evil West' does not extend to inciting civil unrest and violence.

    If you or Bill find this viewpoint 'imprudent', though I don't believe you will, then this is definitely where our paths part company. This is where, at least in my book, prudence blends into spineless appeasement.
    There's not much we can do against Islamic-extremist murderers if they're determined to kill us in the streets, but at least we don't have to listen to their rogue clerics cheering them on from the sidelines.

#106 Re: Not So Free Chat » Political Potpourri VII - The Seventh Seal? » 2005-07-17 17:54:06

Sometimes I wonder whether the lack of a soundtrack in internet conversations like these causes people to misinterpret the mood of some posts. Without cues from a person's 'tone-of-voice', the same post can be taken in various ways - sometimes not in the way it was intended at all(?).

    Josh speaks wisely and I agree absolutely that our agreement on Mars exploration must override our disagreements on some political points.

    In an atmosphere of conciliation, I would point out that my last post had more than a tinge of frustrated resignation to it, which may have gone unnoticed. I feel there is no solution to the barbarity of Islamic extremism, except from within Islam itself, and despair of that religion doing anything about the problem for many years to come.
    I agree with Cindy that the basis of Islam, as it exists in many parts of the world today, is fundamentally flawed in its treatment of women. And that this misogynist-mindset, together with the lack of separation of church and state in Muslim countries, probably is connected with the violence we're seing now.
    I also agree that extreme religions can't be reasoned with, despite Clark's belief to the contrary.

Bill:-

... AND Western fascism-lite wannabes that people like Cindy and Shaun cheerlead for.

    Now now, Bill!  big_smile

#107 Re: Not So Free Chat » Political Potpourri VII - The Seventh Seal? » 2005-07-15 21:44:52

Bill:-

Its not about morality. Its about prudence.

Do you taunt or tease an angry dog, or bait a bear? No, not unless you are an idiot.

    Prudence is good, to a point.
    But is that what they called it when Nazi troops marched into the demilitarized Rhineland in 1936, or when Nazi troops annexed Austria and seized the Sudetenland in Czechoslovakia in 1938?
    When does prudence become appeasement and turn around and bite you in the a***?

Cindy:-

P.S.:  Some (not all) Muslim cultures teach it is okay to murder "the infidel" (anyone who disagrees with their religion and its laws) and also that a woman who merely raises her hands/arms in a self-protective manner to ward off her husband's fists should die.  Or if a young woman is "compromised" it's okay for a brother/father/male cousin to kill her for "dishonoring" the family.  Certain tribes in Pakistan order the gang rapes of women whose male relatives have allegedly committed some wrong.  Flaws in the culture?  I'd say so.  What else are they capable of?  Must be lots of really angry people over there...

    This is the doctrine of the Islamic extremists who are stirring up this violence or participating in it. This is the social structure they want us all to follow. They know it will never happen but feel obliged to attack us anyway because we disagree with them.
    Bin Laden attacked us because American infidels were defiling the Land of the Prophet by their presence. American troops were withdrawn from Saudi Arabia and now Bin Laden attacks us because Muslims were driven out of Al Andalus (Spain) centuries ago!
    A logically consistent plan to advance their demands?
    No. There are no logically attainable demands; no demands at all, except for the annihilation of America, and all the Jews, and the Talibanization of the whole world - none of which is ever going to happen.

Clark:-

To assume that thousands of muslims are all sociopaths defies common sense.

    True. But thousands are apparently in thrall to a sociopathic and totalitarian branch of a world religion - a much more dangerous situation all together.

But not all are nuts, and many make, from their perspective mind you, a sacrifice in order to effect change. They feel powerless and don't see an alternative.

    Effect change? No societal change they want in the West will be effected by killing New Yorkers, Londoners, Spaniards, Australians, or anybody else.
    They feel powerless all right; powerless to impose their medieval interpretation of Islam on those of us who prefer living in the 21st century.
    What alternative don't they see? They don't see the alternative of living their own lives and letting us live ours? They don't see the alternative of worshipping God in their own way and leaving us to do the same? They don't see the alternative of treating women as human beings instead of disposable commodities? They see only one option - to kill everyone (Muslim or otherwise) who doesn't share their insanely narrow worldview? To achieve what?
    Answer: Nothing but bloodshed. Because they have no achievable goal besides that!

...smart people are calling for dialogue, and for inclusion of the disenfranchised in order to provide a legitimate alternative.

    ...to provide a platform for non-violent action to affect [sic] change and have your voice heard.

    ...provide a constructive non violent outlet for people to feel empowered and to have their voices heard.

    A bunch of disenfranchised British subjects got fed up, and revolted. They revolted because they saw no other option to have their voices heard.

    The usual fallacious nonsense spouted by the Western liberal intellectuals and media, who can't see the wood for the trees.
    If Islamofascists are 'disenfranchized' (great buzzword!) in today's world, it's because their own fanatical religious intolerance separates them from mainstream civilization. It's their own doing - no one else's.
    (Comparing them to the American revolutionaries is a specious argument because the American settlers had understandable grievances and logical attainable goals.)
    There's no point in somehow 'allowing' them to "have their voices heard". They're not trying to negotiate some kind of accommodation with liberal Western democracy or the Jewish people ... this is where the breast-beating, guilt-ridden, "mea culpa" brigade lose their grip on reality over and over again, despite the glaring facts staring them in the face.
    These Islamic extremist murderers want all Jews killed and the rest of us to abandon liberal democracy and follow Sharia Law. Negotiation is not part of the deal!
    If these people "have their voices heard", as it's so quaintly and oh-so-reasonably put, all you'll hear - aside from the barking of orders pertaining to totally unacceptable religious, political and social demands - is silence.  That's why they're blowing people up.
    Get it?

    We're fighting a long slow drawn-out war against a foe we can't see. We can create strategies and carry out undercover and/or military actions, but there's no feasible defence against an invisible and implacable enemy with no coherent agenda we can ever come close to dealing with.
    This is a problem which can only be solved within Islam itself - when enough Imams finally see that illogical bloodshed (even against their own brothers and sisters) in a war without an attainable cause, or indeed any sane cause at all, is unacceptable.
    In the meantime, free peoples all over the world will simply have to absorb hit after hit from these murderers. We just have to understand that intermittent terrorist attacks are part of sharing the world with rogue elements of a large religion.

#108 Re: Not So Free Chat » Happy Birthday Dr. Smith- Nov. 6th » 2005-06-22 01:01:28

Warm thanks to all of you for the birthday greetings, which were very much appreciated. I didn't realize Josh was back - a welcome boost for New Mars!
    I can only visit briefly due to current health problem, as some of you know. Thanks again for the good wishes.
                              Shaun.  :up:   smile

#109 Re: Life support systems » Aerogel - don't build - your greenhouse w/o it » 2005-05-29 17:56:44

RobertD:-

If regolith in contact with the greenhouse is molten, you have a more serious problem then greenhouse corrosion.

     :laugh:  Good point!
    I'm not surewhat pressure you want in this PCTFE greenhouse, but presumably it'll have to be cylindrical(?) with the lower 1/3rd or so below the level of the surrounding ground(?)

#110 Re: Science, Technology, and Astronomy » Earth Atmospherics/Weather » 2005-05-28 07:38:45

Yep!
    Those cyclone pictures really bring home to you the awesome power of nature - and its sinister side.
    So beautiful ... so mindlessly destructive.  yikes

#111 Re: Not So Free Chat » Apropos of Nothing *4* » 2005-05-28 07:24:02

I can see both sides of this thing. I can see how the people who want to improve the human condition, by encouraging equality among us all, will see this as a retrograde step, some sort of betrayal. And largely because Aldrin is genuine hero material in most people's eyes.
    On the other hand, I can see the other side as well, the side I think he was indulging in when he said those words to a youthful mixed audience.

    I wholeheartedly sympathize with and support the idea of sexual equality in every department that matters - human rights, equal pay for equal work, and equal opportunity regardless of gender. But I also rejoice in the differences between males and females and I don't have any desire to 'paper over' those differences.

    We all accept these days that everyone should be treated equally, or at least we damned well ought to! What many of us don't understand is that not all of us are capable of contributing equally, either in manner or degree. And who would want us to?
    Young human males are not the same as young human females. They don't think the same way, they don't act the same way, and they don't feel the same way. Females communicate better, they mature more quickly, they learn faster in school at an earlier age, and they don't indulge in risk-taking activities to the same extent as males. Males do take risks, they communicate less readily, they engage in more physical contact based sports, and it's all because of their physically different brain structure and their different endocrinology.
    You can pretend these differences don't exist if you like but you'll run into difficulties if you try it because you're denying a biological reality.

    Of course boys have feelings! And Aldrin knows this as well as anyone else. To try to deny that is to deny an obvious emotional reality.
    But in saying otherwise Aldrin plays to the young males in the audience who bond with other young males via their masculinity, their biological identity. You mightn't like it but it's very real, it's generationally perennial, and it's not going to go away. And it's not evil; it's tongue-in-cheek male to male rapport, celebrating the strengths of the male gender in gentle mockery of the female.
    And don't think the human female doesn't join forces with her sisters to mock the male of the species. She certainly does!

    It's all part of something we call the 'war of the sexes', which has been going on for a long time now. And while we recognize from history the dangers of allowing unfettered dominance of one sex by the other, and take steps to ensure we don't go back to that situation, we attempt to suppress these normal and natural sexual rivalries at our peril. Because, in doing so, we attempt to suppress our own biological nature.

    Females, in general, have certain strengths and physiological advantages in certain departments that the average male doesn't have. And the reverse is also just as true.
    I think we should be able to publicly mock each other's idiosyncracies and weaknesses, and brag about our own gender's innate strengths, without causing an eruption of finger-wagging political correctness.
    As long as there is good humour in it, as long as there is underlying respect and affection, as long as it doesn't translate into actual physical or sociological repression of either sex, I believe it serves to bind us closer together - not drive us apart.

    Let's not take ourselves too seriously - life's too short.  smile

#112 Re: Life support systems » Designer Plants on Mars » 2005-05-27 18:43:26

Rik:-

Back-contamination of course.
And they would have a point. Anything that succeeds on Mars, might find Earth ecosphere paradise and multiply like crazy.

    Hmmm, yes. That's essentially the same point which is often raised with regard to back contamination by indigenous Martian beasties - the 'tough hungry critters from Mars' hypothesis! Except, in this case, they'd be man-made critters.
    But is it really a logical fear?
    Isn't it true that organisms which are highly specialized to cope with a certain environment do badly when taken out of that environment? Any plants designed to do well in an oxygen-free/CO2 atmosphere, for example, are reminiscent of the cyanobacteria and other anaerobic organisms which flourished on Earth before the rise of O2 levels in our air. Now those organisms' populations have declined since their heyday and they hide away in oxygen-poor ecological niches.
    Why would a plant, designed to live in extreme cold on Mars, do well in the comparatively stifling hot conditions of Earth?
    Is it not true that a plant which thrives in the ecological desert of Mars, with virtually no competition from other plants, and with no predatory pathogens to invade it, would rapidly succumb to the survival warfare evident among life forms here on Earth?

    Just because an organism does well in an environment we might call 'tough', doesn't necessarily make that organism 'tough' in any universal sense. A polar bear is one tough customer in northern Canada but, if you were to put that polar bear in the hot humid swamplands of equatorial Africa, for example, I suspect it would keel over and die very quickly!
    I think it's all just a matter of what you're used to.
    No?  ???   smile

#113 Re: Unmanned probes » MPL "Landing" Site Identified?? » 2005-05-27 05:37:56

Thanks for this picture, Sean:-

                       1.jpg

    It's interesting to observe the shape of the darker surface material, which I assume is the actual rocket blast zone(?). And note the scale - which appears to be 2 metres per millimetre.
    From these two pieces of information, we can see that the rocket 'scar' on the surface is elongated and covers a region some 18 metres long but no more than 6 metres wide.

    Is it possible the MPL was coming in on an angle, with too much lateral velocity? Could it be that, rather than cutting out too early, the engine burned all the way down, as planned, but the unintended lateral velocity caused the lander to pitch over on contact and sustain terminal damage?  ???

#114 Re: Unmanned probes » Cassini-Huygens - NASA/ESA Saturn orbiter & Titan lander » 2005-05-27 02:07:19

Thanks again for keeping us up to date with some very interesting stuff about Titan, Cindy.  :up:
    That red spot is a fascinating thing.
    If it is actually a cryovolcano, fuelled by an upwelling of deeper warmer material, I'd be interested to know if its latitude is 19.5 degrees.
    O.K., O.K., I know this is just navel-gazing on my part but I'm still intrigued by the fact that Earth's , Mars', and Jupiter's biggest surface disturbances are all 19.5 degrees from their equators!
                                                            smile

#115 Re: Unmanned probes » Mars Exploration Rovers (MER) » 2005-05-27 01:46:12

From what I've seen of the site so far, I have to agree with Rik. It's a very worthwhile site and I add my thanks to Rik's - thank you Aldo!  :up:   smile

#116 Re: Life support systems » Designer Plants on Mars » 2005-05-26 17:11:49

Cindy:-

*I'm not quite following you on this, Shaun.  ?

    Two apologies, Cindy!

    Firstly, for allowing the reference to Greenpeace to get me off-topic; this thread is nothing to do with it, I know, and I shouldn't have digressed. But I was interested to hear that Rik is a member of Greenpeace and thought I'd mention in passing that I used to be a member myself, before their radicalism turned me off. In retrospect though, after their ship was sunk by the French in 1985, I should have realized they were actually doing a good job as far as protesting against and publicizing French nuclear testing in the South Pacific was concerned. And maybe I should have cut them some slack. [I think the French, the U.S., and everybody else for that matter, should test their nuclear bombs in their own backyard - not mine!]

    Secondly, after many years, and because of my gradual descent into senile dementia (! ), I forgot which crewmember of the Rainbow Warrior was killed in the French attack in New Zealand. I thought it was the captain but realize now it was the photographer - sorry.  sad

    If you're interested, you can revisit the event and check out the salient points of the attack in Auckland at http://library.christchurch.org.nz/Chil … r.asp]THIS SITE.

#117 Re: Life support systems » Nutraffin - Muffins for Astronauts » 2005-05-26 16:40:10

CM:-

A little extra lard and strawberry filling would leave none of that healthy aftertaste.

     :laugh:

#118 Re: Life support systems » Designer Plants on Mars » 2005-05-26 05:23:40

This is an interesting thread and I'm sorry I missed it earlier.  :up:
   [By the way, nice emoticons, Cindy.  smile  And nicely utilized to embarrass the cr*p out of poor old Rik!!  :laugh:  )
    Actually, Rik, I was a fully paid up member of Greenpeace for a number of years myself, believing them to be protecting the seas from overfishing and looking after the whales and dolphins, which I happen to care about. Then something happened to change my mind about them - can't remember what, now - and I've never been back.
    By rights, as soon as the French government saw fit to sink one of Greenpeace's ships in a New Zealand port, and kill the captain at the same time, I should have re-evaluated their worth. [Greenpeace was contesting the right of France to test their thermonuclear weapons in the South Pacific, polluting the pristine waters with poisonous radioactive by-products.]

Rik:-

I only see here what I want to see: they do *not* say it`s impossible for Earth-bacteria to grow or reproduce on Mars, they say it`s hard...

    Yes, indeed. Inadequately sterilized probes have crashed into the Martian regolith on more than one occasion since the 60s. Given the protection of Martian soil and the known existence of subsurface ice/water in many areas, including the equator, a few terrestrial bacteria could have multiplied and evolved over these past 40 years. Perhaps many of them have spread, via subterranean crevices and whatever hydrological system may exist there, and populated much of the Martian crust by now. (A bacterial population can double 4 times and more in one hour if conditions are suitable. Never underestimate the power of a geometric progression! )
    Even if the bacteria and moulds we sent to Mars on probes didn't get a hold, bacteria carried from Earth by meteoritic ejecta on a regular basis over the past 4 billion years almost certainly will have done.
    Oops! There I go on the old soap box again!  :laugh:

#119 Re: Life support systems » Nutraffin - Muffins for Astronauts » 2005-05-26 04:06:41

And this week's grand prize for truly, awesomely unrealistic fantasy goes toooooooo .....
CC:-

If they can take a donut and fortify the crap out of it with nutrients they'd really be on to something.

    <screams, whistles, applause and wild cheering>  big_smile
    [Come on CC, you know perfectly well that any attempt to inject some form of nutritional value into a donut would absolutely crucify the bej**z*s out of its criminally glorious taste!!  Try to get a grip on reality, willya?!]

Cindy:-

Call 'em Mars Muffins.

    Excellent suggestion!  :up:

And:-

Besides, a muffin without butter is like mashed potatoes without gravy.

    Never a truer word spoken (or written). I love butter and I love mashed potato (especially with sweet potato mashed in with it <drrrooooollll> !!)
    And there are some meals which, if served without gravy, are simply an unmitigated travesty of the culinary arts ... meals including mashed potato being primary examples of such!  big_smile   smile

#120 Re: Unmanned probes » Mars Exploration Rovers (MER) » 2005-05-25 17:53:34

CM:-

It's holding together remarkably well for a bunch of dust, don't you think?

    Thinking of brine?  ???

#121 Re: Unmanned probes » Mars Exploration Rovers (MER) » 2005-05-25 17:52:07

Cindy:-

It'd be like someone complaining their car got a flat tire after 120,000 miles of superb and flawless performance.  Sure, some folks might still complain; but they'd look silly for doing so.

     :laugh:  Good analogy!

#122 Re: Life on Mars » Seeing Forests in the Tree of Life » 2005-05-25 06:54:06

A fascinating overview of the possibilities for life and its classification. I particularly liked the last part:-

This is why, at the end of this book I've just written, I'm suggesting that we think about a manning a mission to Mars with a paleontologist, and a manning a mission to Titan with an organic chemist."

    I second that!  :up:   smile

#123 Re: Life on Mars » Lichen on Mars? - Is it? » 2005-05-25 05:16:08

Thanks again, Weave, for drawing our attention to the MER 'micrographs'. As I've said, I'm always interested in looking for fossils because I don't think it's outside the realm of possibility that we might find one in these amazing images.  smile

    However, while I'm very open to the investigation of any and every suspicious rock on Mars, I like to think I have high standards of proof - as I'm sure you do, too.
    Without wishing to appear unduly dismissive of your evidence, I have to say I'm having grave difficulties seeing anything in these two images which cannot be explained by geological processes. And honestly I cannot see anything resembling a flying reptile, no matter how hard I look.

    The point here, I think, is not so much whether there is actually a fossil flying reptile in the rock in this photograph, or not. The point is that any alleged fossil in a Martian rock must be indisputably a fossil .. there must be no room for equivocation.
    Even on Earth, where fossils are known to exist, there has been controversy over certain structures found in ancient rocks. Eons ago, colonies of cyanobacteria (blue-green algae) left large, lumpy, mushroom-shaped formations in the fossil record, which are called stromatolites. And although there is little doubt among the experts about the biological origin of some of the more recent stromatolites found in the rock strata, some of the more ancient ones are not accepted by all scientists as being biogenic. Some believe there are explanations for these extremely old structures which don't depend on bacteria.

    You see my point?  ???
    If the same piece of rock, right here on Earth, which is readily available for detailed examination by our top scientists in the field, can be the subject of such a dispute, then the standard for Martian fossils in pictures must necessarily be very high indeed.
    In order to identify a formation in a Martian rock as being a fossil, that formation must stand out and scream "FOSSIL!!" in a resounding and absolutely irrefutable way!

    My opinion is that the photographs you've pointed out don't pass this test. But, again, I hope you'll continue the search because I think it's worth the effort.  smile

#124 Re: Science, Technology, and Astronomy » Singularity - Black Holes, Gamma Rays, Magnetars, etc » 2005-05-24 05:54:42

Hmmm.
    Yes, he's probably right but then there's always the http://www.npl.washington.edu/AV/altvw8 … Alcubierre Warp Drive.
    In this theoretically sound concept:-

... new space is rapidly being created (like an expanding universe) at the back side of the moving volume, and existing space is being annihilated (like a universe collapsing to a Big Crunch) at the front side of the moving volume. Thus, a space ship within the volume of the Alcubierre warp (and the volume itself) would be pushed forward by the expansion of space at its rear and the contraction of space in front.

    A diagrammatic way of representing this is as follows:-

              warp.gif

    A further explanatory excerpt:-

Since a ship at the center of the moving volume of the metric is at rest with respect to locally flat space, there are no relativistic mass increase or time dilation effects. The on-board spaceship clock runs at the same speed as the clock of an external observer, and that observer will detect no increase in the mass of the moving ship, even when it travels at FTL speeds. Moreover, Alcubierre has shown that even when the ship is accelerating, it travels on a free-fall geodesic. In other words, a ship using the warp to accelerate and decelerate is always in free fall, and the crew would experience no accelerational gee-forces.

    The trouble with the Alcubierre Warp Drive is that calculations reveal creating a warp big enough to accommodate a spaceship within its boundaries requires simply staggering quantities of energy - and negative energy at that!
    But now, there's http://www.npl.washington.edu/AV/altvw99.html]The Micro-Warp Drive, devised by general relativity theorist Chris Van Den Broeck of the Catholic University of Leuven in Belgium:-

Now, however, Dr. Van Den Broeck has proposed an improvement on Alcubierre’s scheme that appears to solve many of its problems. Van Den Broeck observed that most of the undesirable effects of Alcubierre’s drive scale with the volume or surface area of the warp bubble. Therefore, his simple solution is to make the radius of the warp bubble so small that the problems go away. In doing this, he makes use of another trick from general relativity. The interior volume of a region of space bounded by a closed surface, because of space curvature, can be made much larger than the flat-space volume bounded by its surface.

    It may well be true that we'll never cross interstellar distances in minutes, but I'd rather reserve judgment for a few years just in case this line of research eventually proves fruitful.
    Strange things do happen!   :;):   smile

#125 Re: Science, Technology, and Astronomy » Medical Science Potpourri » 2005-05-23 17:44:25

Cindy:-

Have heard about this quack.  Among many other things, he'd refuse to wash his hands between surgeries.

    My mother was a nurse in London before antibiotics became widely available. Yet she maintained they rarely had  in-hospital infections - even following 'dirty' surgical cases.
    The reason for this was the strict control of the environment on the wards by someone called 'the Matron', who ruled with a rigid discipline virtually indistinguishable from that of the military! And she exerted this control over everyone, including members of the public who simply came in to visit ailing relatives. Many matrons were so formidable that even the doctors tip-toed around them and recognized their authority over the wards.

    The rules imposed by matrons were non-negotiable and imposed for a reason: in those days, they were dealing with an implacable microbial enemy against which they lacked the antibiotic weaponry which came after the war. If someone acquired an infection, there was a good chance they would lose a limb or die.
    Therefore, the rules of hygiene were observed at all times and woe betide anyone who even looked like they might be tempted to take a short-cut around them. Hands were washed routinely and regularly - especially between patient attendances - and bedlinen was constantly being changed and cleaned. The wards themselves were disinfected regularly, too, and bedheads, legs and bases, together with any other ward furniture, were washed down with disinfectant between patients. And visitors were forbidden to sit on a bed, being restricted to sitting on a chair near the bed.

    My mother was always horrified at the standards in modern hospitals as she grew older. Obviously, those standards had become more relaxed after we gained mastery of infections using antibiotics. But lately, we've been seeing the rise of in-hospital infections again because of bacterial resistance to our antibiotic arsenals.
    Unless or until we get better antibacterial drugs, I think it's time to re-instate some of the old methods, draconian though they were.
    You can't reason with Golden Staph.  ???

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