November 20
Could gold jewelry, such as a necklace, have toxic amounts of mercury or other heavy metals on
its surface? I know someone who has jewelry from Pakistan. She has a visible ring of excema around her neck where a necklace would be. The excema seems to have spread from there down her back. ThanksRich (talk) 06:27, 20 November 2007 (UTC)
Is Universe expanding or deflating?
If either is the case, how sure are we? -- Taku (talk) 07:23, 20 November 2007 (UTC)
There's another possibility. We are in a big crunch. As we fall together, we're speeding up. Furthermore, as we fall we come apart (expand).
Sure. If you drop a system, the part of the sysytem nearest Earth will get a stronger gravitational pull than the parts of the system furthest away. I'm sure you can see how, over time, and especially if the system is falling 'end over end', the system can be seen to expand.
The Cosmos has also clumped up. Wmap and other observations have shown the early Cosmos was almost completely smoothly spread out. Since then we've clumped up, and clumping up is a feature of a vortex. When you stir your cofee, where do the bubbles go? When you put a tablespoonful of sand in a bucket of water and stir, where does the sand go? To the center, of course. I don't know anywhere else but a vortex, or whirlpool, to look for clumping up.
If the Cosmos is a Whirlpool, maybe shaped just like the Whirlpool galaxy, or our own Milky-Way, then probably therew's also a Black Hole there too, at the center of the Universe.
Could be...
How sharp is that knife?
Is there an official standard (ASTM or similar) for measuring how sharp a knife is? --67.185.172.158 (talk) 08:50, 20 November 2007 (UTC)
Take a look at ISO 8442.5. --80.229.152.246 (talk) 23:57, 20 November 2007 (UTC)
ISO 8442.5 sharpness and knife durability system has been in use ( prior to standardisation) since the late 1960's primarily in the UK. CATRA who pioneeered the system, manufacture a machine that is used widely throughout the World for the measurement of sharpness of knives and blades ranging from utility razor blades to large industrial cutters. They also make another sharpness and edge life durability system for more delicate blades such as surgeons scalpels and shaving razor blades. see for further details
Growing up in zero-g
It must have been asked before but: Is it possible and what are the problems for a child to be conceived, born and to grow to adulthood in a zero-g, weightless environment? Let's say have a litlle family on the ISS for example. Would he survive, what imperative measures should be taken for his survival, what consequences would it have on his appearence? Keria (talk) 13:45, 20 November 2007 (UTC)
- Extended time in low gravity has various harmful effects on the body, such as blood concentrating in the upper body, muscular weakness, and bone density loss. Our space medicine article is sadly inadequate, but it's a big concern for *-onauts. Presumably it would be much more severe for a person who had never been in Earth-normal gravity; it's possible that person could not safely go to the Earth at all. --Sean 14:29, 20 November 2007 (UTC)
Sound from Jupiter
The Jupiter article says:
Does that mean it can be listened to? If so where can I find a recording? Keria (talk) 13:49, 20 November 2007 (UTC)
Crack, pop, whizzz! Thank you very much TenOffAllTrades it helped a great deal. Keria (talk) 15:36, 20 November 2007 (UTC)
physiology
how is human gastro intestinal tract moves?
Can nanomachines potentially cure RNA viruses?
I heard nanomachines can be used in medicine. Are there any thought experiments on using them to cure RNA viruses? 64.236.121.129 (talk) 14:32, 20 November 2007 (UTC)
interaction of infrared with skin
can an infrared beam give unique signature when reflecting from skin or flesh. also can an IR penetrate in flesh and reflect from bones? Neel shah556 (talk) 14:33, 20 November 2007 (UTC)
If you had a gallon of pure white blood cells would it look white?
If not, what would it look like? 64.236.121.129 (talk) 15:41, 20 November 2007 (UTC)
Can radar detect organic flying creatures?
Birds and stuff? Or maybe a human skydiver? If not, is it possible to detect them through other means? 64.236.121.129 (talk) 15:58, 20 November 2007 (UTC)
Why do cows moo?
Why? 64.236.121.129 (talk) 16:20, 20 November 2007 (UTC)
Why hasn't the Polar Bear been reclassified as a subspecies of brown bear?
The Grizzly–polar bear hybrid is a fertile offspring of a grizzly (subspecies of brown bear), and a polar bear. That would make it a sub species of brown bear. It even says so here, http://en.wikipedia.org/wiki/Polar_bear#Speciation So why is it still classified as a seperate species of bear? Shouldn't this have been corrected by now? 64.236.121.129 (talk) 16:38, 20 November 2007 (UTC)
Extinction
What problems are caused from a species going extinct? The ones I know are species naturally producing chemicals that are useful and can't be easily synthesized, and that one species going extinct could cause another one to die out (that one's recursive, but it still works, so long as there is another reason). Both of these would apply to plants more than animals, yet people seem to care more about protecting animals than plants. Why is that? Is this more of a humanities desk question? — Daniel 17:03, 20 November 2007 (UTC)
Being sliced
A common trope in action films is that during a dramatic fight, one combatant will rush past the other with a sword, or shoot a laser through the enemy. The enemy will laugh, apparently unhurt (although the sword is usually covered in blood), shrug this off... then fall apart a couple of seconds later (off the top of my head, I think this happens in Kill Bill, Underworld, Resident Evil and Cube, not to mention countless anime). How much of this is true; I can't imagine that being sliced would be painless, no matter how quick and sharp the blow, but could someone function for a few seconds cut in half provided that the halves stayed together? Laïka 18:42, 20 November 2007 (UTC)
- I remember reading a William Gibson book at some point where a guy had a garrote-type device with a weight on the end where the wire was "only one molecule thick" or some such thing. He would swing it through people and they wouldn't notice for a moment, then fall apart. I remember being nonplussed that it would damage the victim at all . Surely the severed bonds would just reattach? Also perhaps relevant is the urban legend about the invisible jet of steam that can cut you in half: Cecil Adams takes the case. --Sean 02:33, 21 November 2007 (UTC)
A recent issue of New Scientist had a feature on death. The phrase "then, after the standard 10 seconds, you loose consciousness" turned up several times. It appeared in decapitation, heart failure, exposure to vacuum, blood loss. Apparently 10 seconds is how much (more or less) useful consciousness you've got after your brain stops getting blood/oxygen. You miss out on the 10 seconds in situations like "head first into the pavement at terminal velocity" and "bullet to an important part of the brain". --Psud (talk) 12:19, 22 November 2007 (UTC)
molecular weight help
help, I was given this equation about chemistry. Here, I'll show you how it looks like:
A + B -> C + D
I was given the molecular weight for both a, and d; the grams for a and b. I'm supposed to figure out the molecular weight for d. What do I do-I've been trying lots of ways, but I don't know which way is right.
Oh, sorry. I fixed it. I wasn't given the MW for d. :D
whole breast tumour samples
"fewer natural killer cells found in cancer component of whole breast tumour samples" - what's a "whole breast tumour sample"? Do they actually mean a whole breast? Like it's been amputated in its entirety and cut into sections? Methods section isn't part of the paper and I don't have access to it. --Seans Potato Business 19:48, 20 November 2007 (UTC)
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