When you were a baby, you didn't have any teeth at all. Then as you grew, your teeth started to come in. First one, then two - and finally, twenty teeth in all!. But you won't keep these teeth forever. First one, the two, will wiggle loose. Maybe you've lost some of your first teeth already. When the little teeth come out and the big teeth come in, everyone can see - you're growing up.
Follow that garbage truck! ...to the landfill to see how trash keeps piling up...to the incinerator to see how trash can be turned into energy ... to the recycling center to see how a soda bottle can be turned into a flowerpot. Filled with graphs, charts, and diagrams, Where Does the Garbage Go? explains how we deal with the problem of too much trash and provides ideas for easy ways to be a …
A simple introduction to the composition and functions of blood.'
Explains the basic properties of skin, how it protects the body, and how it can vary in color'
Discusses the importance of sleep and what happens to our brains and bodies during slumber.'