The GPS satellites orbiting 20,200 kilometres overhead run their clocks about 38 microseconds faster per day than clocks on the ground — without Einstein's relativity correcting for it, GPS would drift by roughly 10 kilometres every 24 hours

The GPS satellites orbiting 20,200 kilometres overhead run their clocks about 38 microseconds faster per day than clocks on the ground — without Einstein’s relativity correcting for it, GPS would drift by roughly 10 kilometres every 24 hours

Every time a phone locates itself on a map, it is quietly relying on Einstein. The GPS constellation is the largest working experiment in relativity humans have ever built — and it only works because engineers designed it to be wrong on purpose.

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In September 1947, engineers at Harvard pulled a moth from a relay inside the Mark II computer, taped it into the logbook, and wrote 'first actual case of bug being found' — the pest was literal

In September 1947, engineers at Harvard pulled a moth from a relay inside the Mark II computer, taped it into the logbook, and wrote ‘first actual case of bug being found’ — the pest was literal

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