You’ve probably heard weather forecasters on radio or television tell how many inches or centimeters of rain fell during a storm. But how do they know how much rain fell? Scientists measure rainfall…
Imagine that it is five thousand years ago and that you are a rich merchant in the ancient city of Babylon. You have a curly black beard and a purple robe with yellow fringe at the bottom. You’re…
A strange shape moved slowly through the dark-blue water of a tropical sea. It looked like a see-through umbrella. But instead of a handle, it had ragged, lacy strips and strings hanging down from…
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