The Rancho Santa Fe Library offers books, classes, art and more! Check out the agenda and stop by. Coffee and Conversation Adventures on the Pacific Crest Trail—Thursday, Sept. 18, 11 a.m. Dana ...

To come up with a result as weird as this, you need to be using some equally mind-bending math – and indeed, this paradox comes to us from the world of set theoretic geometry. If that’s not familiar ...