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Why does metal stick together in space?Life's Little Mysteries If you push two metal plates together on Earth, nothing happens. In space, they can fuse into one. Here's why.
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How did the Romans build such straight roads?Life's Little Mysteries The Romans have a reputation for building straight roads — but how did they do it?
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What will the Amazon rainforest look like in 100 years?Life's Little Mysteries The health of the Amazon rainforest is key to the global climate, but many dangers threaten to make it unrecognizable in the future.
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Why does it take our eyes so long to adjust to the dark?Life's Little Mysteries Here's why it's so hard to see when we enter a dark room.
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Do you really have to wash rice before you cook it?Life's Little Mysteries Rice is eaten by more than half of the world's population daily. Should everyone be washing it before it's cooked?
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Has all the water on Earth been peed before?Life's Little Mysteries Water, water, everywhere … has all of it been peed out at least once?
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What's the deepest cave in the world?Life's Little Mysteries There are two contenders for the world's deepest cave, and they're in the same mountain range.
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Why can't we figure out how strong gravity is?Life's Little Mysteries Despite dozens of experiments over the years, scientists still don't have a precise measurement for gravity's strength. Why is that?
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How many generations of humans have there been?Life's Little Mysteries Modern humans have been around 300,000 years. How many generations is that?
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