Podcast: How do the five love languages hold up to empirical research? How does gender equality vary by country globally? Tune in to hear highlights from last year’s most popular research.

The first bell echoes off the bricked hallways of Lindbergh High School in Renton, Washington, warning dazed and coffee-clutching students to pick up their pace. It’s December. It’s 7:15 a.m. It’s ...