You've seen your own blood, when you have a cut or a scrape. You can see the veins in your wrist, and you've seen the scab that forms as a cut heals. But do you know what blood does for you? Without blood, you couldn't play, or grow, or learn. That's because just about every part of your body needs blood, from your muscles to your bones to your brain. How does your body use blood? Read and find out
Ages 10 - 14
You've seen your own blood, when you have a cut or a scrape. You can see the veins in your wrist, and you've seen the scab that forms as a cut heal...
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.
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 ...
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.
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. G...
