This is a post about emotion, so — fair warning — I’m going to begin with an emotional story.

On April 9, 1994, in the middle of the night, 19-year-old Jennifer Collins went into labor. She was in her bedroom in an apartment shared with several roommates. She moved into her bathroom and stayed there until morning. At some point she sat down on the toilet, and at some point, she delivered. Around 9 a.m. she started screaming in pain, waking up her roommates. She asked them for a pair of scissors, which they passed her through a crack in the door. Some minutes later, Collins opened the door and collapsed. The roommates—who had no idea Collins had been pregnant, let