When It's OK to Violate Privacy

From a channel Lumen includes in full: Henry Reich's MinutePhysics explains physics concepts (relativity, quantum mechanics, energy, cosmology) in tightly scripted hand-drawn animations, often reviewed with physicists and built around a single clear idea per video.

A 3-minute video from minutephysics's catalogue; the title names its topic.

Video by minutephysics, played through YouTube's embedded player.