He was experimenting with a material known as Siberian red lead, also known as the mineral crocoite (PbCrO4), in 1797. He produced chromium oxide (CrO3) by mixing crocoite with hydrochloric acid (HCl).
1777
he was bored
http://en.wikipedia.org/wiki/Louis_Pasteur#Germ_theory_of_disease
he looked in a microscope
He hated people getting sick.
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