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’s new questions
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Environment
How your seaweed-filled beach pics could help monitor climate change
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Humans
Does quantum physics explain why parcel delivery times are so vague?
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Tom Gauld: The four types of discovery
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Twisteddoodles: ‘Which of my features do you require right now?’
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Space
NASA image captures powerful energy at the heart of the Milky Way
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Humans
How gardeners can help plant-eating insects instead of killing them
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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?
From supersonic bullets to bursting paper bags, our readers explore the fascinating physics of imperceptible loud sounds
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What stops us from falling out of bed while we are asleep? (part 2)
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This week’s new questions
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That time the weather was forecast to be 152 degrees
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Tom Gauld on what Godzilla and King Kong left behind
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