Cats are famously grumpy, but do they have facial expressions?
What is your pet cat trying to tell you? Readers divine feline thoughts
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How long can viruses survive outside the body?
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This week’s new questions
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What is the reptilian skill that allows lizards to walk upside down?
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Time for a rhyme
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This week’s new questions
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Mysterious alignment: How do ancient monoliths still line up with the sun?
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How small does an animal have to be to have small fleas?
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This week’s new questions
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Dusty rain: Why does rain leave a residue behind and where does it come from?
Rain can leave a deposit on normally sparkling windows. Where does this dust come from? Readers explain the Saharan connection
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ACHOO: Why do some people sneeze so many times?
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This week’s 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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