I've been enjoying this series of science videos from NIMS, the Japanese National Institute for Materials Science 1. The series has the wonderful title "A message to future scientists" — they're for kids 😃 2. They feature experiments that are simple enough you'd think they'd be ubiquitous but, to me at least, many are new (how come I'd never seen a demo of a Halbach array before?!?) Just tried the bottle experiment and was delighted it worked https://www.youtube.com/watch?v=ahmr91iWE50