Joe Frazier knocks down 🥊 Muhammad Ali in "the Fight of the Century" on March 8, 1971 @facethenation

A mountain pass during the 1925 Tour de France 🗻 🚴 Ottavio Bottecchia rides alone in the Pyrenees. He was the first Italian to win the Tour de France @facethenation

Winston Churchill on camel in front of the Sphinx in Egypt, February 15, 1921 @facethenation

Mark Twain in Nikola Tesla's laboratory, 1894. The current is being passed through the human body to bring the lamp to incandescence 💡. Tesla can be seen in the background on the left @facethenation

Australian troops, with a kangaroo mascot, onboard a ship bound for the South African War, 1900 @facethenation

It's the first big oil well in Iran and it sets off a wave of exploration, extraction and exploitation that will change the region's – and the world's – history, 1908 @facethenation

Policemen fire at a new metal bulletproof shield. 😱 The shield's inventor, Elliott Wisbrod, is the man holding it in February 1933 @facethenation

Boiler explosion on a steam locomotive. 🚂💥 The explosion turned the flue pipes of the engine's superheater unit in this twisted mass on May 12, 1948 @facethenation

The first Iranian pilot, Ahmad Nakhjavan (2nd right), graduated from flight school in France in 1925. This paved the way for the beginnings of the Iranian air force @facethenation

This is not a dance. Atlanta Braves catcher Greg Olson goes head over heels after tagging Minnesota left fielder Dan Gladden out at home during Game 1 of the 1991 World Series @facethenation

The first successful vacuum cleaner was invented in 1901 by Hubert Cecil Booth, a British engineer.

Booth's machine took the form of a large, horse-drawn, petrol-driven unit, which was parked outside the building to be cleaned with long hoses being fed through the windows, and it took four to six people to operate it.

Of course, these early versions of vacuum cleaners were bulky, noisy, smelly and commercially unsuccessful.

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Michael Faraday invented the first electric motor in 1821. One of the greatest scientists of the 19th century @facethenation

Doctors using X-ray machine to feed venous catheter into patient's heart, 1947 @facethenation