You may recall from your high school physical science class that water molecules have polar charges. As such the positively charged water molecules bond to the negatively charged ones bonding the water molecules firmly and in all directions with one exception: the surface.
There lies a tension that allows the surface of water to extend slightly above the rim of a glass or container without pouring over. It is this same tension that water skeeters use to scurry across the surface of ponds and creeks.
Well, in this experiment, a person can pour the contents of one container over a distance of inches. It is accomplished by using a length of thick string. Simply take one end of the string and wrap it around the bottom inside of a small glass.
Take the other end and dip it into a water filled glass or beaker. Stretch the string out so that wet string extends out and make sure the string has some tension in it. With the water filled beaker raised above the empty glass, begin pouring out the water slowly.
Despite the distance between the glasses, the water will stream down the wet string with water molecules clinging to string because of surface tension. Steadily, the water in the glass will have been emptied almost entirely into the other container. Amaze your children with the trick and have them give it a try. The experiment beats mind numbing video games any day. Besides, you never know when knowledge of water tension may come in handy.