Because the day is so long, and there’s so much Internet!
A simple Flash game about epidemiology, with pretty graphics and music. Click to make an explosion; when the explosion hits a dot, the dot explodes. You’re trying to make chain reactions. (Discovered via Cthulhia)
No, not the magnetic toys. This is an addictive little physics simulation. Those little units are three-legged acrobats. They have inertial and gravitational mass (the slider control on the right changes the gravity), springy legs, and magnetic hands/feet. Add acrobots, subtract them, toss them around, see what happens. I like putting 15-20 of them in there, maximizing the gravity till they all slump down, then minimizing the gravity and seeing them leap and toss each other around.
And if all that wasn’t enough, Kevin Church presents drunk monkeys!