The Weirdest Thing I Learned This Week hits Apple, Spotify, YouTube, and everywhere else you listen to podcasts every-other Wednesday morning. Female dunnocks have figured out the ultimate relationship power move: they make copulatory calls during sex, but only with their side partners. But when researchers finally started studying female birds as active agents with their own agendas, they discovered something much more sophisticated: a female using strategic infidelity to secure maximum resources while maintaining genetic diversity. They’re supposedly quite pampered throughout the process, but the process still takes a toll on their health over time. Here’s the rest: We started using metal cans in 1810, but didn’t invent the can opener until 1855.