An interview with a transgender man, who started life as female and began taking testosterone injections several years ago. He explains how testosterone changed his views on nature vs. nurture for good.

The men and women on staff at This American Life decide to get their testosterone levels tested, to see who has the most and least, and to see if personality traits actually do match up with hormone levels. It turns out to be an exercise that in retrospect, we might not recommend to other close-knit groups of friends or co-workers.

The story from the prologue continues, with the groom who refused to be a groom, and the one person who'll probably remember the fake wedding, namely, the fake bride.

Reporter Hanna Rosen did an investigation of those new antibacterial products—the antibacterial soaps and lotions, the antibacterial pizza cutter and linen and underwear. In her article, she mocked these products as ineffective.

Germs were first understood at the turn of the 20th century and it turns out that the aesthetics of everyday life during this century—the way we dress, the way we groom ourselves, the way we make our homes—are all partly a response to this newfangled idea of germs.

Mark O'Brien is a writer in California, who lives most of each day in an iron lung, thanks to a childhood case of polio. It's an excerpt from Jessica Yu's Oscar-winning documentary.