Six Researchers Who Gave All to Their Work | English Audio

Nghe Audio về các nhà khoa học cống hiến nghiên cứu cho nhân loại. Audio http://www.fileduty.com/download/510/se-itn-chen-guangcheng-5may12.Mp3 TEXT SHIRLEY GRIFFITH: At the start of the twentieth century, the United States Army had a Yellow Fever Commission. The Army wanted medical experts to study yellow fever and find a way to stop the disease. One team went to Cuba to test the idea that mosquitoes spread yellow fever. The team was led by Walter Reed, the Army doctor and scientist noted for his work on infectious diseases. In August of nineteen hundred, the researchers began to raise mosquitoes and infect them with the virus. Nine of the Americans let the infected insects bite them. Nothing happened. Then two more let the mosquitoes...

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