If you ’ve ever put gas in a car , you ’ll get it on that the pump magically knows when to contain spewing fuel into the cooler . That ’s super useful , and secure too . But how does it get it on when to stop ?
Is it witchcraft ? Psychic powers ? Clever guesswork ? Or , you have it away , some simple but improbably smart engineering ? learn this video and find out ! [ YouTube ]
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