Twit or true: are owls really intelligent?
They are a symbol of wisdom, but are they any smarter than other birds? Readers explain
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Number games: how to choose a PIN
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This week’s new questions: all about mulberries
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Life
Why fun is so important and how we benefit from play
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Life
Beautiful close-ups of endangered big cats make real catwalk look tame
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Tom Gauld on the science of taking a break
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Twisteddoodles on when a butterfly gets a new look
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Earth
Did an asteroid impact 65 million years ago really kill the dinosaurs?
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91色情片
Small wonder: See the microscopic knotted beauty of a surgical stitch
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Humans
The scientific shortcuts to cooking delicious caramelised onions
Browning onions takes way longer than recipes say. Here are two tricks to cut down the time, says Sam Wong in the first of a new series on the science of cooking
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Banana split: Artwork provokes fresh conflict between art and science
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Burning hot: Are all flames the same temperature?
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Dead before his time: a question about time travel
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This week鈥檚 new questions
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