This is my second instructable that I learned in science class a few months ago. It is cool because after a few steps you can crush a can faster than you can blink.
Step 1: Things You Need
The Things you Need.
. A can...
. A stove,or bunsen burner. (some kind of heat source that can boil water)
. Tongs (to hold the can while heating it).
.A bowl (to fill with water)
. Water (room temperature water to fill the can with, and cool water to fill the bowl with)