How to win at Battleship, in advance of the movie of the same name. Link goes to the non-technical description at Slate; here’s the technical version, by Nick Berry.
How subway networks evolve, from Scientific American.
Given a sack of sugar, an unbalanced scale, and two 5-pound weights, measure exactly 10 pounds of sugar. (H/T Dave Richeson)
Should we get rid of the “=” sign in mathematics?, from Republic of Math.
A mathematical challenge to obesity: the New York Times’ Claudia Dreifus speaks with Carson Chow of Pitt, who has a blog.
God plays dice 
The people who solve the Rubik’s cube in world-best times (around 4 seconds) use an algorithm developed by Jessica Fridrich. She’s a professor electrical engineering, I think. And here she is doing “finger tricks”: http://www.youtube.com/watch?v=ghtZDrLN-xM