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: Technology: Where We Came From and Why We’re So Lonely
10:30

The Backstory: The London Fog That Killed 12,000
10:19

The Backstory: Sibling Squabbles in Royal Families
09:59