HackerTube / Video
The Geometry of Causality
PBS Space Time
PBS Space Time explains how spacetime geometry and light cones determine the order of events and what can cause what. It visualizes causality in special relativity.
Used as a go-to reference for relativity arguments, such as spacetime intervals being the same for all observers, and as a suggested follow-up for physics fans.
6 Hacker News mentions · 2017–2022