In Praise of Mistakes [Science tattoo]

Andrew, a medical student, writes,

"I recently got a tattoo of Penicillin G on my arm.  As someone who stumbled into medical school as a non-traditional student after a few career missteps, I appreciate a good mistake.  There are few mistakes that were as amazing and important to medicine as the 'discovery' of Penicillin.  Had Alexander Fleming remembered to close his laboratory's window, who knows where we would be in the fight against infectious disease?"

In case you missed my announcement