> What’s in a sand castle? Millions and millions of tiny grains of sand. The many grains of sand are packed together to make a single shape—a castle with towers, walls, and bridges. And what…
> Sound comes from just about everywhere— from friends talking, radios > playing, jet planes roaring overhead. Even your breathing makes a tiny > sound. > > None of these sounds seem very much…
The zebra is a mammal. Do you have a pet mammal? If you have a dog or cat you have a mammal. Hamsters and gerbils and guinea pigs are mammals, too. And so are you. Maybe you’ve seen a cow…
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