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Anton van Leeuwenhoek discovers blood cells -
Gabriel Fahrenheit created the first mercury thermometer. -
Florence Nightengale is the founder of modern nursing. -
Joseph Lister began using disinfectants and antiseptics during surgery. -
William Roentgen discovered X-rays. -
Sir Alexander Fleming discovered penicillin. -
Jonas Salk developed the polio vaccine. -
First Heart Transplant -
Clone Sheep. Dolly the Sheep -
The first vaccine to target a cause of cancer.