I quibble with infrared radiation being described as "heat,"<p><a href="http://en.wikipedia.org/wiki/Heat" rel="nofollow">http://en.wikipedia.org/wiki/Heat</a><p><a href="http://en.wikipedia.org/wiki/Infrared#Heat" rel="nofollow">http://en.wikipedia.org/wiki/Infrared#Heat</a><p>but there is some interesting information on the submitted site.