¿Por qué no se cae la luna? : Y otras 52 preguntas sobre ciencia

Why is the Earth round? How much does it weigh? How was the universe formed? Who invented the internet? Is it possible to build a time machine? What are black holes? Why does a slice of bread always fall butter-side down? This book answers all these questions, and many more! Why Doesn't the Moon Fall? is educational, easy to understand, and illustrated with lots of humor.