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Frostbite

Frostbite results when the body is ex­posed to extreme cold. It usually occurs in the ears, fingers, nose, and toes. The imme­diate effect of frostbite is that the frostbit­ten area becomes whitish...

My skin covers me

My skin is tough. I scratch it and scrub it and scrape it and rub it. Sometimes I bruise it or cut it. But it always grows back. Tiny bits of color are in my skin. They make my skin black or brown...

Frozen food

Fresh foods keep their color and flavor for only a short time. You have to eat them soon after they are bought. Is your piece of apple pie homemade, or did it come frozen? Sometimes it's hard to...

Moving molecules

Here is a way to show that hot and cold molecules move at different speeds. A hot-and-cold contest Materials - bowls (2, large) - food coloring - medicine dropper - pan (bigger than bowl) -...

Hiding from winter

Amphibians are cold-blooded. Their bodies are just about as warm or as cold as the air or water around them. So when winter comes, and the days get colder, an am­phibian's body gets colder, too. The...