This is a simple and easy science experiment, yet it still surprises people.
We are going to find the center of gravity of the meter stick. That is the point where it will balance on your finger. This is very easy to do if you understand balance and friction. Simply hold your hands out in front of you about two feet apart. Stick out your index fingers, as if you were pointing at someone and lay the meter stick across them. Now slowly move your hands together. When your fingers meet, the meter stick will be balanced on your fingers. Notice the point on the ruler where they meet. It is the center of the stick. Now is when the surprising part starts.