When do I get the most UV light?
Why is ultraviolet radiation strongest when the sun is high? Readers respond
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Why do duvet covers swallow other laundry?
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This week鈥檚 new questions
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Is there a maximum tree width?
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Are longer bicycles more efficient?
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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?
Some birds bob their heads backwards and forwards as they walk. Why? As they are descended from dinosaurs, would two-legged ones like Tyrannosaurus rex have done the same?
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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?
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