What if, every time you needed to turn on a light, you had to sacrifice a part of yourself? That's the question proposed by designer Mike Thomspon with his Blood Lamp. To operate it, a user breaks the top off, mixes in an activating powder, cuts his or her finger with the broken glass, then puts in a few drops of blood. The lamp contains a chemical called luminol that reacts with the iron in the blood, creating a bright blue glow. More at LiveScience.