Our Pick
Posted on @rawstates
The microwave oven
1945
Waltham, Massachusetts
Coolcaesar at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons
Percy Spencer, a self-taught engineer who never finished grammar school, noticed a chocolate bar melting in his pocket beside a radar magnetron. He tried popcorn next, then an egg, which exploded in a colleague's face. The first commercial oven weighed 750 pounds.
That was 1 of the hidden places.
Location: historic site
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