Level crossing: Why is it hard to walk if there’s a large drop nearby?
Why is it hard to walk if there's a large drop nearby? Readers respond with their explanations
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Running while cycling: Why does my nose run when I’m on my bike?
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This week鈥檚 new questions
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Let it go: How does an earworm get in and how do you get it out?
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Broadly speaking: How do we know the universe is expanding?
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This week鈥檚 new questions
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Lend a hand: Is there an advantage to being left or right-handed?
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Aural enhancement: Do people with bigger ears have better hearing?
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This week鈥檚 new questions
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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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