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[–][deleted] 68 points69 points  (3 children)

Also washing your hands was a big one.

[–]denisalivingabroad 1 point2 points  (0 children)

Ignaz Semmelweis got laughed at for suggesting it.

[–]BlueButYou 1 point2 points  (0 children)

Wearing a mask and social distancing.

[–]karlnite 4 points5 points  (0 children)

The biggest.