Monday, December 8, 2008

helium - produced by decaying uranium and thorium

Pikachu at the Macy's day parade is full of helium, which the New York Times describes as "a finite and increasingly scarce resource, produced extremely slowly by decaying uranium and thorium." Like anything else, when it gets scarce and expensive, people start thinking about using it more carefully. So this year, instead of just releasing it into the air, they recovered it.

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