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.

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

Which of these toys were your favorite growing up? See more in this clip from Season 1, Episode 7, "Toy Wars."

Unearthed in Egypt, the Gnostic gospels allegedly contain secret teachings said to come directly from Jesus himself.