A Child’s Puzzle Helped Uncover How Magnets Work

3 pointsby eaguyhnover 6 years ago

1 comment

DerekLover 6 years ago

This is reprinted from Quanta Magazine. Previously discussed: <a href="https://news.ycombinator.com/item?id=19013993" rel="nofollow">https://news.ycombinator.com/item?id=19013993</a>