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When were boats invented?The oldest physical boat is a canoe from roughly 10,000 years ago, but evidence suggests humans have been using watercraft for at least 50,000 years.
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How long does it take the sun to rotate?The time it takes for the sun to completely rotate depends where on the sun you are measuring.
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Why does the moon look larger when it's on the horizon?The moon looks enormous when it's near the horizon — why is that?
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Why don't you usually see your nose?Our nose is right in front of us. So why don't we normally notice it?
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Could there ever be a worldwide internet outage?We've all dealt with bad internet connections. But could the entire internet ever collapse?
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How much of your body could you lose — and still survive?Five vital organs are essential for life, but survival is more medically complex.
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What's the oldest river in the world?The oldest river predates the dinosaurs. But how do we know this?
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Why doesn't stomach acid burn through our stomachs?The hydrochloric acid in your stomach can burn through metal — so why doesn't it burn through your stomach?
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Did any cat breeds develop naturally?Humans have undoubtedly bred cats to create certain breeds, but did any of these feline breeds emerge naturally?
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