How small does an animal have to be to have small fleas?
How small does an animal or insect have to be before it can't have fleas, mites or lice?
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This week鈥檚 new questions
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Dusty rain: Why does rain leave a residue behind and where does it come from?
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ACHOO: Why do some people sneeze so many times?
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This week鈥檚 new questions
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Level crossing: Why is it hard to walk if there’s a large drop nearby?
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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?
How do we know the universe is expanding rather than, say, atoms are shrinking? Some fundamental physics explained
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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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