Terry Tao gives general tips on solving analysis problems.
A charming animation from Taiwan (h/t Bobak Nazer).
Apparently optical-scan ballots aren’t so simple to deploy.
A surprising fact about almost everywhere convergence.
James Fallows can Google that for you.
An Ergodic Walk 
That post on almost everywhere convergence is simply beautiful. Thanks!
Actually, Krish sent me that link so he should probably get the credit ;-)