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How To Make a BlubberHow To Make a Blubber

Brrrr! That's what most people shout when they jump into cold water. Humans can't swim very long in very chilly water without a wet suit. But marine mammals, like polar bears and walruses, have no problem diving into icy seas. How come? One word: blu…

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How to Make a CompassHow to Make a Compass

It’s not easy to get lost. Today, people have excellent maps and GPS satellite system that shows us where we are. A thousand years ago, people didn’t have either. When they were sailing on the ocean, it was tough to figure out their location. Around …

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