Why does it balance? It's all about center of mass. If an equal amount of mass is on each side of the balance point, the object will balance. If not, the object topples over. Because the forks curve around the sides of the glass, the fork/toothpick combo remains balanced. To make the experiment even more impressive, light the toothpick on fire and watch it burn all the way to the glass edge. It will still remain balanced! See our video below. Very cool!
And here are the final pictures.
Give it a try! This experiment is sure to wow your kids!