Is there a maximum tree width?
If the height of a tree is limited, what about its width? Readers give their thoughts
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Are longer bicycles more efficient?
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This week’s new questions
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Tom Gauld on dropping a bowling ball out of a balloon for science
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Twisteddoodles on graphs that speak for themselves
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Environment
Ghostly clouds are appearing more often due to climate change
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We may have finally settled just how far penguins can poop
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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
Why does my dog take the same number of steps as me, and why don鈥檛 we have eyes in the backs of our heads? Send us your thoughts
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Tom Gauld on singing the scientist blues
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Twisteddoodles on having your research referenced
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Life
Hundreds of thousands of slime moulds can merge together to find food
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There鈥檚 a font that you can鈥檛 criticise Goldman Sachs in
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