Hat tip to Hackaday for this one. It turns out that a nanosecond is the time it takes light to travel 11.8 inches. A very handy rule of thumb to have around as you explain large distances and small times.

Hat tip to Hackaday for this one. It turns out that a nanosecond is the time it takes light to travel 11.8 inches. A very handy rule of thumb to have around as you explain large distances and small times.

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