Think about “now.” Too late, it’s already become “then.”

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“If two people, one 6 feet tall, the other five feet tall are bit at the same instant by two mosquitoes, the “ouch” takes longer to travel to the taller person’s brain than the shorter person’s brain. There’s hardly a difference, but it’s different enough to make two different ‘nows.’ “

- Quote by Robert Krulwich of Krulwich Wonders, Art by XKCD