hmmm... interestingly though I don't think his heat sink is entirely copper - some of those coins look suspicously shiny... likely that they are merely copper plated steel - we've been using them in the UK since 1992 (not many people know that our copper coins ain't copper). For those interested (and I hope there aren't many of you ), some links....

http://www.24carat.co.uk/silverpennies.html
http://www.tclayton.demon.co.uk/decbr.html

me thinks his egg would cook better if he actually used 100% copper - <god how sad am I?>

Z