dun wrote:M.Magis wrote:I read the story about the lady that claimed to have invented it. She's using the term "invented" very loosely. She had a patent for a propeller looking thing built around a thimble looking dome. It fit over a finger and in theory would spin around a few times. She's comparing that to these things that have nearly frictionless bearings and will spin for 5 minutes at a time.
It's the bearings that fascinate me
Same here. My youngest son has one that I thought was battery powered when I first tried it. Just the slightest touch and it'll spin for nearly a minute.