Turns out, two atomic clocks are indeed better than one. And what role does sleep play in memory suppression?

Hola. In this lesson we'll be practicing ser in the present tense as well as the rules presented in a previous video.

There's a downside to the upside, and believe it or not, an upside to the downside. Here's why considering the worst case might lead to better outcomes. Hosted by: Hank Green (he/him)