Could you bake a potato in an oven that doesn’t get hot? Yes, you could, if it’s a microwave oven. In minutes, the potato gets steaming hot, but the oven stays cool! And the glass or china dishes you…
> At sunrise your shadow on the ground is very long—longer than you > are! At sunset your shadow is long again, but it points the other way. > And in the middle of the day, when the sun is high in…
Nearly a thousand years ago, in the year 1054, a new star suddenly appeared in the sky. It was tremendously bright—so bright it could be seen even in daytime. For two years, the strange new star…
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