We all have to regularly be somewhere on time. But what did people do before cell phone alarms or even alarm clocks? Animals, body cues, and knocker-uppers were just a few of the methods.

The Backstory: Columbus Day? Who Really Discovered America?
07:27

The Backstory: How to Create a Female Serial Killer
10:19

The Backstory: Death: How We Handle Our Expiration Date
08:34