Get ready to galvanize your gray matter and step into the wonderful world of knowing more than ever before with Who Knew? The Big Book of Questions That Will Make You Think Again. More than 130 fascinating articles--a mix of favorites from the Who Knew? series and new material--across twelve chapters will answer questions such as "Can dogs smell emotion?" and "How did the Incas build Machu Picchu?" Packed with information and quirky illustrations, chapters cover subjects such as weather and climate, the human body, art and architecture, animals and plants, ancient history, food and drink, literature, geography, sports, science, film and theater, and the universe and space. A quiz at the end of each chapter will test your knowledge so that you can be sure of being the smartest elephant in the room!