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from the science-is-fun-dept

hitchhiker: image of "don't panic" towel with a rocketship and a 42 (Default)
[personal profile] hitchhiker
Friday, January 11th, 2019 02:31 pm



https://twitter.com/HLAGroupOx/status/983370740320915456
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hitchhiker: image of "don't panic" towel with a rocketship and a 42 (Default)
[personal profile] hitchhiker
Monday, January 14th, 2019 07:35 am (UTC)
yes :) it's a photoswitchable dye that changes colour when the light of the right frequency is shone on it.
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