Waves & Whirlpools: on Energy, Structure, Matter, & Antimatter (Part I)

When physicists try to describe spacetime and its interactions with matter, the analogy we invariably seem to fall back on involves an elastic sheet, with bowling balls creating curvature on it and marbles orbiting those bowling balls like planets around a sun. A teacher uses weights and marbles to demonstrate gravity as the curvature of spacetime.Image Credit:Still taken from Youtube. It's convenient and engaging to have a hands-on demonstration, and it's great for getting across the major poin...