Quote of the day
Progress is a nice word. But change is its motivator. And change has its enemies.
Joan Birman

Born: May 30, 1927 (age 97)
Bio: Joan Sylvia Lyttle Birman is an American mathematician, specializing in braid theory and knot theory. Her book Braids, Links, and Mapping Class Groups has become a standard introduction, with many of today's researchers having learned the subject through it.