Idiom of the Day
base one's opinion on (something)
to form an opinion from something
I based my opinion on the man's previous work and decided not to give him a job.
Fact
In 1945 a computer at Harvard malfunctioned and Grace Hopper, who was working on the computer, investigated, found a moth in one of the circuits and removed it. Ever since, when something goes wrong with a computer, it is said to have a bug in it.
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