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hmmmm why don't milk maids get small pox maybe its because they get cow pox
boy would you like to help me with an experiment
yer why not
got nothing better to do
the boy is then deliberately infected with cow pox
the boy gets ill then gets better
then the boy gets the more deadly small pox disease in an open cut
eureka!! the boy hasn't got infected. this must have been because the body has already learnt how to stop cow pox which is similar to small pox
yay I'm alive
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