Julian Hawkins explains how traffic lights work, noting that they don't know why they are changing, but know when they need to change.

Feng E, a musician from Taiwan, performed a captivating ukulele cover of the Hans Zimmer theme for "Interstellar".

Liquid Death collaborated with Pit Viper to create a pair of sunglasses with UV protection for dead people so they can safely "see the light".

The History Guy explained the history of sugar, noting how this product evolved from humble beginnings into a worldwide phenomenon.