Dry ice might be one of the coolest substances on earth. 

Dry ice is the solid form of carbon dioxide frozen to -109.3 °F and it is mostly used as a cooling agent. It is so cold that it cannot be touched by hands or it can cause frostbite. The coolest thing about it is that when it melts, it turns into a gas and evaporates so there is no water left like regular ice. Did you know you can use it to make bubbles that appear to be filled with smoke? It’s true and it’s SUPER SIMPLE to do in this Smoking Bubbles Dry Ice Experiment!

ages 4+