NY Times Blog - Series on Mathematics

A series of 15 blog posts by Steven Strogatz, professor of applied mathematics at Cornell University, about the elements of mathematics. For adults, and not meant to be remedial, "the goal is to give you a better feeling for what math is all about and why it’s so enthralling to those who get it. "

http://opinionator.blogs.nytimes.com/category/steven-strogatz/