Yard stick demonstration

http://science.wonderhowto.com/how-to/break-yardstick-with-atmospheric-pressure-302609/

http://www.shareably.net/molten-aluminum-ant-colony/#

Ant hill art

Ant hill art

How hard water can be softened links

http://www.ag.ndsu.edu/pubs/h2oqual/watsys/ae1031w.htm

Hard water animation for inquiry

http://bcs.whfreeman.com/chemcom5e/content/cat_010/Unit1_Media/CC_5e_U1_SecD.swf

Hard water inquiry video

What makes hard water hard inquiry

http://phet.colorado.edu/en/simulation/soluble-salts