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If a green plant doesn’t get enough sunlight, it will die. The best way for a plant to get lots of sunlight is to grow tall. But if a plant with a very thin stem grows too tall, it will just topple…
When Rick’s uncle came for his usual Sunday visit, Rick was waiting for him at the door. Uncle Frank was a scientist—an astronomer—and Rick had an important question to ask him. “Uncle Frank,…
When you have a favorite toy that breaks, you fix it and make it almost as good as new. Buildings and castles and cities don’t break. But sometimes they wear out and need fixing, too. When we make…
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