In 1947 – Walter Brattain dumped a semiconductor experiment into a thermos of water and unexpectedly saw a large amplification of electricity. Working with John Bardeen they developed it into a new amplifier that would eventually be called the transistor.
In 1970 – The Soviet Union landed Lunokhod 1 on Mare Imbrium on the Moon. It was the first roving remote-controlled robot to land on another world.
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