Swimming strokes: which is the fastest?
A continuation of the question about the speed and energy efficiency of swimming strokes. One reader points out which stroke is fastest
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This week鈥檚 new questions
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In the ink: why are blue highlighter markers less bright than others?
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Good consumers: is online shopping greener than going into town?
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This week鈥檚 new questions
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End of an era: how long did it take the dinosaurs to die out?
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Fresh fruit: does washing produce reduce the risk of food poisoning?
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This week鈥檚 new questions
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Freewheeling: does one finger provide significant support on a bike?
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Time and tide: what is the smallest body of water with lunar tides?
There's more to tides than you might think, so it can be hard to tell if water, for example in a lake, is affected by the moon, explains a professor of sea level science
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This week鈥檚 new questions
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Clean limbs
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Still waters
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Battery power
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