Someone who is grouchy is often called a \”crab.” That doesn’t seem fair to the real crabs. There’s no reason to think that any of them are grouchy! In fact, they’re a big family with many odd and…
Rattling trucks, roaring jets, squeaking chalk, and creaking doors don’t make music. They make sounds we don’t want to hear. These unwanted sounds are called noise. Noise is hard to stop. Like other…
Our galaxy, the Milky Way, has more than a hundred billion stars. But it is not the only such “cloud” of stars in space. There are at least a billion other galaxies, and probably more, and each of…
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