Light covers 299,792,458 metres every second, and it still takes about eight minutes to get here from the Sun. Today's pack moves a bit faster.
Cipher · Saturday 24 October 2026
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Ciphers
Light takes its time
Ten puzzles on the speed of light, from prison tap code to a Nihilist cipher closer. Answers are hidden at the foot.
Photo: Jeremyida002 / Wikimedia Commons (CC BY-SA 4.0), cropped
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