00:00If you don't know about this, let me know about this example.
00:04So now we take this example of America.
00:06This is early 20th century.
00:10This case is called Typhoid Mary.
00:12And this is the history of medical history.
00:16So this was Mary's name cook.
00:18She used to cook and she was a carrier of typhoid.
00:22So she is not washing her hands, she is cooking.
00:24So what is happening? Everybody who eat food, they get typhoid.
00:28So what did she do?
00:30People start falling in.
00:32She would leave that place, she would go somewhere else.
00:35So slowly, slowly, slowly, people got down to her.
00:39She is the carrier.
00:41Mary was not the only one who didn't wash her hands.
00:43Nobody washed their hands.
00:45People were learning anew,
00:47that she had to wash hands.
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