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1William Herschel, a musician and amateur astronomer,constructed a telescope and looked for comets.In 1781 he found one, observed it and decided it couldn't be a comet because of the circularity of its orbit.It was Uranus, an unkown planet.This discovery let him become a full- time astronomer.

2Alexander Fleming researched bacteria. He left a bacterial colony and went on holiday.when he returned, it was covered in mould which killed the bacteria.Soon he extracted penicillin, the first antibiotic, from the mould.