Are longer bicycles more efficient?
If tandems are more efficient than regular bikes, does this trend go on forever? Our readers respond
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This week’s new questions
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Does magnetism decay over time?
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How do chameleons change colour?
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This week鈥檚 new questions
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Would dinosaurs bob their heads like birds do?
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How can I win at Monopoly?
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This week鈥檚 new questions
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Why don鈥檛 worms harm plant roots when they stir up soil?
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Why do some hairs stop growing while others keep going?
Why do some hairs, such as in the聽eyebrows, only reach a certain length, while the hair on your head continually grows longer? Readers respond
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This week鈥檚 new questions
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Why didn’t babies evolve to allow parents to get more sleep?
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Is our sense of new smells keener? What’s the evolutionary benefit of this?
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This week’s new questions
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