Elasticity videos

Bryn's 3 videos - Part 1 - http://www.youtube.com/user/BrynJonesOnline#p/u/11/difGsq0aD8E

Part 2 - http://www.youtube.com/user/BrynJonesOnline#p/u/10/6mv_vwkSuyc

Part 3 - http://www.youtube.com/user/BrynJonesOnline#p/u/9/yzdk_lqg8Qs