Quick hitter...

After a couple busy weekends (600 miles in two days' driving over Memorial Day weekend, 1100 miles in two days' driving last weekend; details to follow soon), here are a couple "Best of"s from recent reading:

Science video of the day: Diet Coke and Mentos
Largest Cities through history: link
5-dimensional Rubik's cube
and, a time sink: Web Sudoku