Sometimes I have to write stuff so I won't forget how to do it. This is one of those times. In my recent post on the angular size of a soccer goal, I created a contour plot. Despite what you might ...

Planning a Fourth of July getaway? Use less gas—and cut your emissions—by easing up on the pedal. Rhett Allain The Best Smart Chess Boards for Beginners and Masters I played the ultimate game of ...