Is toothpaste essential? Aside from fluoride, what is its value?
Readers disagree about whether teeth-clearing is all down to the brush, or whether toothpaste has all sorts of benefits.
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Would taller people benefit from bicycles with larger wheels? (part 2)
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This week鈥檚 new questions
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Does the expansion of the universe apply to atoms and objects like me?
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Could polar bears be established in the Antarctic to save the species?
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Why hasn鈥檛 time been decimalised (part 2)
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This week鈥檚 new questions
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Why do herring have lots of small bones, and mackerel the opposite?
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Why is a cup of tea so satisfying and comforting?
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Where did the bacteria that turn milk into yogurt come from?
Did the bacteria in milk products evolve after humans started to store milk and, if not, what did their forebears do?
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This week鈥檚 new questions
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Would taller people benefit from bicycles with larger wheels?
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Is it possible to have a loud sound that is too brief to be audible?
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What stops us from falling out of bed while we are asleep? (part 2)
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