How Author:Kathie Billingslea Smith How long do animals live? — How high is the sky? — How can we tell the age of a tree? — How do spiders spin their webs? — How do shots help me stay healthy? — How do blind people read? — How big were the biggest dinosaurs? — How do fish breathe underwater? — How much is one million? — How did people tell time before there were clocks? — How do I remember ... more »things?