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When you were born, your skeleton was already inside you. However, there are creatures in the sea that are born without skeletons—so they make their own. But their skeletons are on the outside! …
If you spread cold butter on hot toast, the butter won’t stay cold very long. Some of the heat from the toast passes into it. Soon the butter is warm, too—as warm as toast. Heat energy can spread….
a meteorologist using a computer map to forecast the weather a pilot and weather forecaster using flight charts and weather maps
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