Ice cube Glue
Over a plate, press the flat sides of two ice cubes together. Slowly count to 30, then let go of one ice cube. Why do they stick together?
When you pushed two ice cubes together, you created pressure between the two flat sides. Pressure melted the ice, making a thin layer of water in between. When you released the pressure, the water refroze, "gluing" the two cubes together.
Spinning in the Wind
Into Thin Air