Why do only some materials glow under UV light?
Phosphorescence is all down to tardy, excited electrons, and without this there would be no glow-in-the-dark paints
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What is the best way to store images for the next 100 years? (Part 2)
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The universe is expanding, but what is it expanding into? (Part 2)
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This week鈥檚 new questions
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Humans
Can quantum mechanics help a UK council plan when to collect bins?
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Tom Gauld predicts a machine revolution sparked by CAPTCHA pictures
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Twisteddoodles: A guide to lights on artificial intelligence systems
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Space
Dust devils’ subtle trails across Mars revealed in bold blue
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How can our own farts smell tolerable when other people鈥檚 smell awful?
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Why are there no birds that hibernate?
The difficulty of taking flight when plumped up makes hibernation all but impossible for birds, but there is one exception
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This week鈥檚 new questions
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Space
The sky-measuring trick that every stargazer should know
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Humans
The neoliberal think tank that wants to sell the moon
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Tom Gauld creates a telescopic Total Perspective Vortex
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