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"What should we have for dinner?" To one degree or another, this simple question assails any creature faced with a wide choice of things to eat. Anthropologists call it the omnivore's dilemma. Choosing from among the countless potential foods nature offers, humans have had to learn what is safe, and what isn't. Today, as America confronts what can only be described as a national eating disorder, the omnivore's dilemma has returned with an atavistic vengeance.

Just looking at the periodic table can be enough to give young science students a serious headache. But as you’ll soon find out, all those mysterious numbers and letters are clues to the amazing world of elements. The brainchild of Siberian superchemist Dimitri Mendeleev, the periodic table represents the 111 known elements, from hydrogen and oxygen to nobelium and lawrencium. But this doesn’t mean there are only 111 elements in the universe.