What are the origins of the yoghurt-making bacteria in milk?
Bacteria ferment the milk sugar lactose to lactic acid, which sours milk and coagulates milk proteins. What do bacteria ferment in lactose-free milk?
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This week鈥檚 new questions
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How fast should I cycle to avoid punctures?
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If sitting cross-legged is bad for us, why is it so comfortable?
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Is there any harm in drinking too much tea? Part 2
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This week鈥檚 new questions
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Why do we experience music that is out of tune as unpleasant?
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Is toothpaste essential? Aside from fluoride, what is its value?
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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
How do photons 鈥渒now鈥� to travel at the speed of light? And what is the evolutionary reason behind superstitious behaviour?
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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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