Book excerpt: If the groundhog sees its shadow, there will be six more weeks of winter. Moss grows only on the north side of a tree. No two snowflakes are alike. You may have heard these common sayings or beliefs before. But are they really true? Can they be proven using science? Let’s investigate seventeen statements about Earth, weather, and the environment and find out which ones are right, which ones are wrong, and which ones still stump scientists! Find out whether all deserts are hot! Discover whether it’s true that a ring around the Moon means rain or snow is on the way! See if you can tell the difference between fact and fiction with Is That a Fact?