From Rainmaker1973 https://twitter.com/Rainmaker1973 on Twitter: Centripetal vs centifugal, the beer stays in the glass. Chapeau and thanks for the physics lesson https://www.youtube.com/watch?v=Zjqrx7wrpJc&feature=youtu.be https://twitter.com/Rainmaker1973/status/975419148691017734/video/1 https://chirp.cooleysekula.net/attachment/49111