Who decides how long a second is? - John Kitching
5:16
How fast is the speed of thought? - Seena Mathew
6:16
Einstein's twin paradox explained - Amber Stuver
8:07
How do nuclear power plants work? - M. V. Ramana and Sajan Saini
5:34
Why do we, like, hesitate when we, um, speak? - Lorenzo García-Amaya
5:31
Why don't perpetual motion machines ever work? - Netta Schramm
6:14
A Brief History Of (Keeping) Time
25:10
How an Atomic Clock Really Works: Inside the HP 5061A Cesium Clock
17:34