Why do stars twinkle? …Why is the ocean salty? Why do eyes have different colors? Why does the brain need oxygen? …Why are some people left-handed? Why do old eggs float? …Is garlic good for you? Why do mirrors reflect? Why have computers become so small? …Why do jets fly at high altitudes? Why is the pool table green? …Why does a boomerang come back? Why do newlyweds go on a "honeymoon"? …Why is Easter a movable holiday? Why do we say "left in the lurch"? …Why do cats always land on their feet? …Why do crabs walk sideways? Why is the greenhouse effect a threat? …

Hundreds of questions about the universe and Earth, how our bodies work, the food we put on the table, the origins of holidays, traditions, and idioms, our pastimes, the secrets of the natural world, and the marvels of technology we encounter every day at home and work. The answers, accompanied by photos, illustrations, and charts, are a treasure trove of information, anecdotes, and curiosities.