In 1928, Alexander Fleming ____ penicillin by chance when he forgot to clean a dish. This ____ medicine and ____ to the development of lifesaving antibiotics. In 1957, Russia ____ Sputnik 1, the first ____ satellite to successfully ____ Earth. In 1961, Vostok 1 completed one orbit around the Earth carrying the 27-year-old Russian cosmonaut Yuri Gagarin. Nikola Tesla ____ the use of Alternating Current (A/C) to send power over huge distances. He paved the way for our modern electricity ____ and is referred to as the man who ____ the world. In 1799, French soldiers ____ a flat stone near Rosetta, Egypt. 'The Rosetta Stone' had ____ in Egyptian hieroglyphics and Greek on it and by comparing the two, experts were able to ____ the meaning of the hieroglyphics, which had been ____ for centuries.

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