Today on 91av
All the latest on newscientist.com: the end of online anonymity, sites match tourists with home chefs, bouncing baby cosmos, India's Mars mission and more
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Life
High-vis gecko becomes poster reptile for Amazon
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Environment
The Photo Ark: We have to see them to save them
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Enigma Number 1772
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Feedback: Ship of fools
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Stick in the mud
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Long-haul racers
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Ticks and tocks, sir
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Quantum question
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