Who Knew? The Big Book of Science Questions That Will Make You Think Again includes more than 100 fascinating articles across twelve chapters that will answer questions such as "Why can't we go faster than the speed of light?" and "How green are electric cars?" This compilation of scientific knowledge consists of entries from Who Knew? Physics and Who Knew? Human Anatomy, plus dozens of brand-new articles. Chapters cover subjects such as cosmology, astronomy, planet Earth, forces and materials, life on Earth, botany, zoology, the human body, the brain, medicine, computers and technology, and the future. A quiz at the end of each chapter will test your knowledge so that you'll be ready for mastermind status in no time!