Rescue the Ice Cube!

How can you get an ice cube out of a glass of water using only string and salt? The PreK/K were stumped. We learned that salt melts ice-- the kids made some great connections to salt trucks and the blue crystals that you sometimes see on stairs. By resting the string on the ice cube and pouring salt on it, the ice cube melts a little and re-freezes over the string! After a few tries, we were able to rescue the ice cube!