What is the most efficient way to stir to dissolve something in water?
Zigzag motions, figure-of-eight and whirling vortices - the best way to stir sugar into a cup of tea isn鈥檛 as straightforward as you might think, say our readers
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Why is the noise of aeroplanes louder in colder weather?
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Why are birds mostly monogamous, but not mammals? (part 2)
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This week鈥檚 new questions
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Is it a fossil? Is it a beehive? Scientists can’t make up their minds
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Humans
Relics illuminate the wreck of HMS Gloucester, a 17th-century warship
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Tom Gauld on bedtime fears
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Twisteddoodles on an unusual zombie infection
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Space
A stargazer’s guide to managing light pollution
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Do I weigh more at night due to the gravitational pull of the sun?
Our readers debate the impact on our weight as we orbit the sun
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How do eardrums convey sound? Don鈥檛 the various frequencies interfere?
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In which direction in the sky did the big bang take place? (part 2)
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This week鈥檚 new questions
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Did public demand to watch moss grow overwhelm the ‘Mosscam’?
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