Since we talked about crushing cans, I found a pretty neat can crushing video!
Since we discussed pressure, one of the things that I wondered about was how water towers work. This article explains that.
http://people.howstuffworks.com/water.htm
I found a good pressure project for kids too like how to make a fountain!
This link talks about how to calculate pressure!
http://www.scienceclarified.com/everyday/Real-Life-Physics-Vol-2/Pressure-How-it-works.html
