Night watch: How do sleep trackers work?
Sleep trackers claim to know what stage of sleep you are in. But how do they do this? Some excellent answers from our readers
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Seat of wisdom: Have we always known it’s the brain?
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This week鈥檚 new questions
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The nose knows: Where does the smell of rust come from?
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Radio gaga: Why does a phone cause radio noises?
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This week鈥檚 new questions
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Nuts for apples: Squirrels behaving oddly
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Awful eaters: Does anything eat foxes?
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Come clean: What鈥檚 the difference between shampoo and shower gel?
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This week鈥檚 new questions
Why do some people sneeze multiple times, and how small does an animal have to be to have no fleas?
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Atomic space: What is in the space between a proton and an electron?
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Hot and cold: Why do you feel cold at the same temperature in winter?
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This week鈥檚 new questions
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Room for improvement: Compliment first or bad news first?
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