Why do dogs and horses roll on their backs when happy?
Dogs roll for three reasons, horses for one, say readers. But they don't do it because they are happy
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This week鈥檚 new questions
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Technology
Your DNA could transfer to a weapon you have never touched
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Technology
Satellite image captures a hyperconnected English Channel at work
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Liana Finck cartoon
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Technology
How the US almost introduced a universal basic income 鈥� 50 years ago
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Technology
Make a rain alarm with copper tape and a BBC micro:bit
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On the hot seat: The mysterious case of the exploding Floridian toilet
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Far-sighted: How can some people see at great distance?
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This week’s new questions
Is online shopping better for the environment? And can you ride a bike with no hands?
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91色情片
Can we halt multiple sclerosis? Catherine Lubetzki is finding out how
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Technology
Bubbles show their iridescent beauty as light journeys through
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91色情片
Louisa Aldrich-Blake: a trailblazer for female surgeons and a war hero
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Liana Finck cartoon
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