(Usually I’ve been posting weekly links on Sundays, but I was on a road trip all week and so I couldn’t keep up with what was coming over the wires too well. Also, road trips inspire some mathematical thoughts; you’ll see them later this week, I hope.)
An excellent metafilter post has links to lots of different types of graph paper.
A lecture by Steve Strogatz on social networks, one of the 2011 Simons lectures.
A free online forecasting textbook (under construction) by Rob Hyndman and George Athanasopoulos.
Back of the envelope physics problems via Cosmic Variance
A metafilter thread on the history of the stockbroker scam.
God plays dice 