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This is a link post Red hot nickel ball in water. Needs sound.
Preview says no, but given that it's had in excess of 1.1M views, and the general geekiness of it, I fully expect to be called on this one.
(I helped save b3ta! barryheadwound Mul-ti-pass? Multipass!, Wed 9 Jan 2013, 11:52, , Reply)
This is a normal post Well that was fucking awesome.
Also check out that blackbody radiation!
 (I helped save b3ta! The Coast Of Yemen, Wed 9 Jan 2013, 11:59, , Reply)
This is a normal post Yeah man! Blackbody Radiation!
*looks up blackbody radiation*
 (I helped save b3ta! barryheadwound Mul-ti-pass? Multipass!, Wed 9 Jan 2013, 12:02, , Reply)
This is a normal post ........ didn't expect that.

(Spin Its a thing., Wed 9 Jan 2013, 12:07, , Reply)
This is a normal post It's a lot more laid back than you might anticipate, no?

(I helped save b3ta! barryheadwound Mul-ti-pass? Multipass!, Wed 9 Jan 2013, 12:12, , Reply)
This is a normal post
impressive. although personally, I thought the blackbody radiation let it down.
 (I helped save b3ta! feckler https://twitter.com/LeonardEctric1, Wed 9 Jan 2013, 12:12, , Reply)
This is a normal post Yeah. Bloomin' Blackbody Radiation
*still trying to find a definition that I can understand*
 (I helped save b3ta! barryheadwound Mul-ti-pass? Multipass!, Wed 9 Jan 2013, 12:14, , Reply)
This is a normal post
I just went on to Wikipedia to nick some stuff and then offer you a pseudo-simple comedy explanation.

I scanned through it, thought 'fuck,thats a lot of words' and ran away.
 (I helped save b3ta! feckler https://twitter.com/LeonardEctric1, Wed 9 Jan 2013, 12:37, , Reply)
This is a normal post
I even tried Simple Wikipedia entry on the subject (http://simple.wikipedia.org/wiki/Black-body_radiation).

Errr.... is there a Simple Simple Wikipedia mode?

I think it's basically Hot Stuff Glows; and that Hotter Stuff Glows More.

Presumably: increasingly Hotter Stuff will first shine Infra-red light, then visible light, then UV light, and so on up the electromagnetic spectrum.
 (The Incredible Sulk Finally remembered his password on, Wed 9 Jan 2013, 21:10, , Reply)
This is a normal post Racist.

(Jimbotfu Bummed in the gob again, Wed 9 Jan 2013, 13:18, , Reply)
This is a normal post Alot of work goes into making Doctor Who sound effects

(Victoria'sBeard Different political view? I hate you!, Wed 9 Jan 2013, 14:18, , Reply)
This is a normal post I am late to the party...
but found out a bit more about the reaction. Apparently the water was fairly hot when the ball was put in it causing a Leidenfrost reaction (see here for more info: en.wikipedia.org/wiki/Leidenfrost_effect).
 (Studentken is looking for motivation on, Thu 10 Jan 2013, 13:43, , Reply)
This is a normal post woo Leidenfrost effect!
I learned about this just before xmas at a warwick uni xmas physics lecture thingy. The Leidenfrost Effect means you can quickly dip you hand int a vat of liquid nitrogen without it freezing. basically the massive difference in temperature means there is an insulating layer of gas between the hot object and the cold object (which is easily visible in he video above), first time i'e actualy seen it visibly though.
 (evilging www.drivenlikethesnow.co.uk, Fri 11 Jan 2013, 12:26, , Reply)