Earth Day's Environmental Origins

While Daylight Savings is fairly harmless today, it's origins lie in one of the most violent episodes of world history.

Katherine Switzer was the first woman to run the Boston marathon in 1967. Take a look back at her accomplishment and those of other record-breaking female sports stars.

From biblical lore and Norse mythology to medieval intrigue and modern pop culture, this ominous date has accumulated a disturbing legacy that continues today.

You know to avoid black cats and breaking mirrors, but did you know not to cut your nails at night? Learn how to keep luck on your side around the world, as we explore 13 lesser known superstitions in this episode of History Countdown.