www.pbs.org/newshour/hea... this is a great piece, not least because it shows you how massive breakthroughs often come down to a handful of contingencies, intuitions, and ridiculous tolerance for failure at just the right point in time

The real story behind penicillinThe discovery of penicillin, one of the world's first antibiotics, marks a true turning point in human history -- when doctors finally had a tool that could completely cure their patients of deadly in...www.pbs.org