Toshiba rolled out a four-legged robot designed to clean up after nuclear disasters.
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Beethoven premiered Fidelio in Vienna, Austria, which was his only opera.
Queen Elizabeth II married Philip Mountbatten at Westminster Abbey in London.
Snake fossils found in Rio Negro Province, Argentina, showed snakes with hind legs that lived over 70 million years ago.
Zarya, the first International Space Station module, was launched from the Baikonur Cosmodrome.
Oxford Dictionaries declared 'climate emergency' as the word of the year for 2019.
