I was listening to NPR today - they had a piece about how Parrots can dance. They commented that parrots and elephants are the only species other than humans that can genuinely adapt their moves to the speed of the music and to more complex beat patterns. They went on to explain that the probable reason for that is that both parrots and elephants are good mimics!! The idea being that in order to be a good mimic, you have to be able to adapt to the rhythm of some other sounds in order to mimic them.
OK - but who ever heard of elephants being good mimics?! I can't imagine a talking elephant - what they heck would they mimic?
SteveBaker (talk) 00:14, 1 May 2009 (UTC)
Here's a BBC online article about elephant and bird dancing: http://news.bbc.co.uk/2/low/science/nature/8026592.stm —Preceding unsigned comment added by 98.17.33.211 (talk) 08:08, 1 May 2009 (UTC)
I read something interesting:
Does an early case of mild swine flu immunize one against a more severe case should this become a fully-fledged pandemic? People who are infected with swine influenza H1N1 will have immunity, or at least partial immunity, should there be a full-fledged pandemic. But influenza viruses mutate constantly - they can become more or less severe.
If I understand this correctly, then shouldn't health officials take samples of the mild form of the virus, and prepare to give it to everyone, if ever a more virulent form of the virus appears? --Phenylalanine (talk) 02:09, 1 May 2009 (UTC)
Bad idea, this virus is dangerous now since, even if it only kills half of one percent of those it infects (I'm guessing from bad statistics) nobody has immunity to it. Even a half of one percent of the human population is three million deaths. Tim Vickers (talk) 19:54, 1 May 2009 (UTC)
Can someone explain to me the whole process of deepening -- I did read the article, and I understand there is a surface level component and an upper atmosphere component involved. I just don't get how an initial turbulence developing around a minor disturbance in a stationary front triggers strengthening of a low pressure system. Winds will tend to circulate and spiral inwards into a low pressure system, but presumably, the low strengthens by convective updrafts. What reinforces the initial updraft? John Riemann Soong (talk) 05:25, 1 May 2009 (UTC)
I was reading an article on an invisability cloak that has been created by smoothing light around the object like water flows around an object. This is at present very small; what are the difficulties of making this on a large scale? Could you not group together X number of small parts to make it bigger?Chromagnum (talk) 05:49, 1 May 2009 (UTC)
Hey, no offence, but the fact is, YOU ARE NOT GETTING THE POINT.
Understand this, when sodium reacts with ethanol, sodium ethoxide is formed. If it reacts with water, it forms NaOH with hell lot of exothermic activity. Now, if sodium reacts with SAND, yes SAND, not WAAATTTEEERRR or ETHAAANOLLL, are there any products formed? If u are unable to answer and say it's SPOON FEEDING, you might as well change the definition of SPOON FEEDING.
Thanks for ur concern —Preceding unsigned comment added by 123.49.43.236 (talk) 05:50, 1 May 2009 (UTC)
The Silicon in SiO2 isn't really acidic. It's in fact, not hydrogen, so it would take some effort to pry off. (Presumably, Na giving its electron to oxygen is more favourable than giving it to less electronegative silicon.) In fact, silicon and oxygen are fairly well ionically bonded (with some partial covalent character), so your first issue is dissolving that Si-O bond. Melting it sounds like a good option. SiO2 also reacts with hot NaOH to yield sodium silicate. I'm not sure if the high heat is required for solubility, or for driving an endothermic reaction, but Na reacts exothermically with water to yield NaOH, so a reaction between sand and sodium isn't that all impossible. Your main barrier is that both of your reactants are solids. For a non high-temperature alternative, perhaps "dissolve" (or crush) the sodium in a non-reactive organic solvent and pass it through a sand column chromatography mixture, and collect the appropriate eluent? I don't know what the yield would be, but it sounds like a possible mechanism. John Riemann Soong (talk) 06:35, 1 May 2009 (UTC)
Also, what about adding sodium, sand and water? Sodium hydroxide would be formed as an intermediate, the reaction would be exothermic, the hydrogen would ignite, making the sodium hydroxide even hotter, so now you have adequate delta-H to complete the reaction (I think?). Add in sand and you get sodium silicate. (Theoretically.) John Riemann Soong (talk) 06:38, 1 May 2009 (UTC)
The Kaboom is energy! So you need to get energy from the reaction of
The energy for the elements is normally zero. And the numbers for the other two you can get from the table of Standard enthalpy change of formation and the sodium oxide page. The numers are
You get two mol of Na 2 O for every mol of SiO 2 so yo double that number. -911 is more negative than -828.4; this means that the SiO 2 is energetically on a lower level and that it is more stable. You would not get energy from that reaction and without energy no KABOOM!!!!! .--Stone (talk) 08:12, 1 May 2009 (UTC)
The easy way to answer this question: This MSDS for sodium says to cover a large spill with dry earth, sand or other non-combustible material. So if the sodium supplier says to cover it with sand if spilled, I think it is a safe bet that sodium doesn't react with sand. No chemistry required. anonymous6494 13:57, 1 May 2009 (UTC)
Suppose the ideal condition of no friction, and a region of low pressure or high pressure. Wouldn't air slowly move across the isobars eventually? I'd suppose you have air parcels which once, having gotten into the system, would continue to blow parallel to the isobars. But the initial set up (non-equilibrium) required some displacement from high to low. So wouldn't there be slow but steady movement of air across the isobars? Just wondering. John Riemann Soong (talk) 08:07, 1 May 2009 (UTC)
The other thing I'm wondering about is the whole Coriolis Force and PGF balance. Why does the parcel keep its initial horizontal velocity component but not its velocity in the PGF direction. I assume when PGF = CF, there is no acceleration, but there is still velocity. Or is there sort of like an elastic spring motion? (Funnily, this is probably not related to the encouragement of troughs and wavelike motion, isn't it.) John Riemann Soong (talk) 08:07, 1 May 2009 (UTC)
Anyone know what the longevity of a large dinosaur was likely to have been? Also, did they hatch from eggs? How long did they take to hatch? 207.241.239.70 (talk) 09:34, 1 May 2009 (UTC)
Moved from Miscellaneous Desk
A widely circulated sms message says that a mobile handset's radiation is 100 times higher when the battery is low. Is there any basis for this?
Do radio waves travel through the human body, or does it block them? --TammyMoet (talk) 12:06, 1 May 2009 (UTC)
Thank you all for this - I got the mechanism as well as the answer! cool!--TammyMoet (talk) 17:36, 1 May 2009 (UTC)
what are the most common basics to staying beautiful through the years —Preceding unsigned comment added by 94.27.137.4 (talk) 13:32, 1 May 2009 (UTC)
All absoulute rubbish beauty is in the eye of the beholder>>>the precieved beauty that is in magazines is what is above>>>plus the smoking and staying out of the sun is all about health nobody is ugly nobody is perfect you are what you are!! a better question would be what do i need to do to remain healthy? Dont step in front of a bus/smoke/eat/drink/breath or any other crap that is told to the masses about staying healthy>>example one of the oldest men to live on the planet chain smoked x number of smokes since his early teens; from china if i recall. Have fun is proberly the
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