Today on 91av
All the latest on newscientist.com: an eccentric French marquis who was the first dream hacker, the biggest news of 2013, narcolepsy and more
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Space
Cosmic explorer Gaia embarks on star-mapping mission
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Today on 91av
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Environment
Snow monkey leaps into hell
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Enigma Number 1780
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Feedback: Positive beauty of laboratory tests
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Pedal or push?
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Big bright spark
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We bid a fond farewell to Enigma
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Space
Infrared reveals stunning colours of asteroid’s crust
The rainbow of minerals on the asteroid Vesta aren't visible to the human eye – but this grey space rock comes to life when seen by infrared space cameras
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Today on 91av
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Space
Yoo-hoo Yutu! Chinese rover snapped posing on the moon
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The million-Twitter giveaway: Our best stories, free
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Earth
Nightmare before Christmas for snow-swept Syrians
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