Short answer: Every four years, in the same years as American presidential elections and summer Olympics. Longer answer: Almost, but not quite, every four years. Looking for a free mini puzzle? Play ...

Each year has 365 days. Well, almost. Every four years (give or take), our calendars receive an additional day. So, as you're making leap day plans for this year, here's a quick primer on how it came ...

February 29th birthdays only happen every four years because during the other three years, the shortest month of the year only has 28 days. A person born on February 29 is often referred to as a ...