Answers to approximately 135 of kids' science questions about people, animals, and the natural world, such as why cats purr and why our fingers wrinkle in water

"Tender and illuminating. A beautiful debut." --Rebecca Stead, Newbery Medal-winning author of When You Reach Me A heartrending and hopeful story about a nonver

The failure of the UN climate change summit in Copenhagen in December 2009 to effectively reach a global agreement on emission reduction targets, led many withi

An illustrated tour of the planet exploring ecosystems large and small, from reefs, deserts, and rainforests to a single drop of water—from the New York Times

How much of Earth's surface is covered by water? How do the northern lights get their colors? Planet Earth has been home to mankind for hundreds of thousands of