http://www.boingboing.net/2009/09/23/lamp-that-runs-on-hu.html
"Mike Thompson's "Blood Lamp" is a single-use lantern that draws its energy from a drop of your blood, making you consider the cost of energy in a uniquely personal way.

For the lamp to work one breaks the top off, dissolves the tablet, and uses their own blood to power a simple light. By creating a lamp that can only be used once"
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