Leap Years Don't Happen Every 4 Years
Why the open web links it
Explains the complex rules behind leap years and why they aren't simply every four years.
Linked by 12 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including jwpepper.com, exercism.org, flooxernow.com, keefermadness.com, lifeisanecho.com.