Freewheeling: does one finger provide significant support on a bike?
It isn't easy riding a bicycle without using the handlebars. Several readers offer explanations for why this is the case and how you can learn anyway
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Time and tide: what is the smallest body of water with lunar tides?
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This week鈥檚 new questions
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How not to cheat at Scrabble: change the value of all the letters
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Humans
Buddhist monk Gelong Thubten on the science of mindfulness
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Earth
Aerial photographs reveal odd and beautiful glimpses of our planet
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Humans
Sir William Ramsay added a whole new group to the periodic table
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Mind
Dr Herbert Kleber brought evidence-based treatment to drug addiction
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Space
How to find the North Star and Southern Cross
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