When I was in 4th grade I came up with a brilliant idea.
One could use electromagnets to lock doors.
With huge amounts of excitement I told my father my about my idea, an electronic locking system with so blatantly obvious applications. Admittingly I was a little crushed when he explained that they've existed for years and are already used in every modern office building.
At least my design looked better.
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from Quora http://ift.tt/2kWOYuu
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