06/17/2026
The Birthday Paradox will break your brain.
How many people need to be in a room for a 50% chance two of them share a birthday?
Not 183. Not 100.
Just 23.
This is the kind of mathematics we teach at Harvard this summer.
π Harvard Faculty Club Β· Boston Β· July 20β31
π cybermath.org/harvard-summer-math-camp