First published in The Atlantic on October 26, 2025.

1. Fast and Slow Piles. This works well as a starting or closing activity. Students sort math fact cards into fast and slow piles. This visual way of tracking facts highlights which facts come ...

The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...

Can you drill a hole in a cube that an identical cube could fall through? Prince Rupert of the Rhine first asked this ...

The skulls the group members play today are modeled after that of the Corythosaurus, a duck-billed dinosaur with a bony ...

For teachers, the numbers six and seven have suddenly taken on a new—and dreaded—significance this school year. From French class to gym class, students are frequently saying (or shouting) “six-seven” ...

How ANOVA helps ensure process data lead to accurate, defensible decisions. The two-sample t-test determines if two population means are equal. Typical applications involve testing whether a new ...

Here’s a plot fit for a Hollywood movie: A Harvard Business School professor goes to Las Vegas and conquers “Sin City” not by a display of Tony Soprano muscle, but by hiring math geeks and computer ...

Oct 27, 2025 Applied Category Theory 2026 is taking place 6–10 July in Tallinn, Estonia, and it’s preceded by the Adjoint School Research Week, 29 June – 3 July.