Book excerpt: How much does a blue whale weigh? How big is big? Using visually dazzling equivalents, How Many Elephants in a Blue Whale makes concepts like size, speed, and mass easy to grasp, and fun as well. Get the scoop on how many Eiffel Towers it takes to reach the top of Mount Everest and how fast a cheetah would have to run to outpace a Ferrarri. An irresistibly entertaining way to get a fix on how things in our world are related, this compendium is perfect for trivia lovers and those fascinated by popular science.