Before electric refrigerators, "iceboxes" were made of wood and filled with ice.
Iceboxes used various materials to keep the ice frozen and the food inside cool, including cork, tin, zinc, sawdust, and seaweed. In 1835, Jacob Perkins patented a refrigerator with a liquid ammonia vapor-compression cycle.
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Obstacles 5 year s ago
Well the first digital electronic computer was built by the British for code breaking https://en.wikipedia.org/wiki/Colossus_computer. ENIAC can be claim first if you define first general purpose computer....hey ho!
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Pretty 5 year s ago
#3 lol having to explain that iceboxes were filled with ice.
#10 An old choir director of mine lived next door to one of the guys who developed the earliest patents for home microwave ovens. They were approved and being marketed by the 70s, but he wouldn't have one in his house until the 90s because they still leaked too much radiation of some sort.
#10 An old choir director of mine lived next door to one of the guys who developed the earliest patents for home microwave ovens. They were approved and being marketed by the 70s, but he wouldn't have one in his house until the 90s because they still leaked too much radiation of some sort.
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Obstacles 5 year s ago
Edison gets way too much credit as usual. He didn't invent the light bulb he perfected it. What took him so long was that he didn't read through any of the work of previous scientists instead making their same mistakes over and over. I believe it was after Eastman came along that he got things organized and started making some actual progress.
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Place 4 year s ago
#14... false
#10 An old choir director of mine lived next door to one of the guys who developed the earliest patents for home microwave ovens. They were approved and being marketed by the 70s, but he wouldn't have one in his house until the 90s because they still leaked too much radiation of some sort.