The math problem that stumped thousands of mansplainers - Vox

This statistics problem went viral in 1990.

Tip Hero - This “Easy” Math Problem Actually Has Most People Stumped

Thousands Stumped by Simple Math Problem, Goes Viral

THE MONTY HALL PROBLEM — Even Math Geeks Get It Wrong

A Nice Math Problem, Which One is Larger ?

12 ball puzzle

A.J. Jacobs — How to Be Less Furious and More Curious (#588) - The Blog of Author Tim Ferriss

Mathematics - The Monty Hall Problem

Holiday Math: Should You Trade Your Gift? – National Geographic Education Blog

Geometry - The Grazing Goat Example Problem

Monty Hall Problem (AKA Survivor Do or Die Twist) - I Get It Now