The Disappearing Cup

acetone dissolves Styrofoam

Acetone dissolves a Styrofoam cup because of the principle like dissolves like.

Bending Water

bending water with a balloon, charging by induction

When the balloon is rubbed on a pair of jeans, electrons are wiped from the jeans to the balloon, causing a net negative charge on the balloon. The charged balloon is held near a thin stream of water. Charges in the water rearrange so that the positive charges in the water become attracted to the negatively charged balloon, and the stream of water bends. The rearranging of charges is pronounced because water is a polar molecule.