The FBI has released new photos showing Navy Yard gunman Aaron Alexis on the day of the shooting.
Aaron Alexis drives his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate on Sept. 16, 2013.
Have you ever wondered where the tradition of putting up a tree for Christmas came from? Or why we light a menorah for Hanukkah? Find out about the interesting origins of many holiday traditions right here.