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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, then 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.

Put on your socks and shoes -- and don't forget your ears

We're going on a listening walk. Shhhhh. Do not talk. Do not hurry. Get ready to fill your ears with a world of wonderful and surprising sounds.

What happens to food when you eat it?

Read and find out about your digestive system and how it turns food into energy your body can use.

Why do you get sleepy?

When you feel tired, your body is telling you that it needs a rest. Everyone needs sleep. Babies need lots of sleep. Grown-ups need less. But no one can go without sleep for long. A team of scientists stayed awake for as long as they could to see what could happen. Read and find out some wide-eyed facts about the science of shut-eye.

Night and day, whether you're asleep or awake, your heart is always beating. Read and find out how your heart works and how to keep it healthy.

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. This classic picture book is a fascinating exploration of what happens to our trash.

Now rebranded with a new cover look, this picture book is filled with fun charts and diagrams to explain how we deal with the problem of too much trash. Activities throughout the book empower kids to help the environment, whether it's by separating trash from recycling or using a...