request for recommendations for contemporary topics in undergrad mechanics of materials class

Hello everyone,

  I am currently teaching an undergraduate mechanics of materials course.  I would like to spend one class period on contemporary issues.  I am wondering what suggestions mechanicians may have.  I have noticed in recent years that several topics are of interest.

1. thin films

2. soft tissue/soft materials

3. fracture mechanics

(I must add I personally don't know much about these, but I see these come up often. )

Clearly I can't cover all of these, but if I was to pick just one of these topics, what should be covered and does anyone have a suggestion where I could find some helpful info on material to present.  My class period is 50 minutes long.

 I would appreciate any suggestions you have to offer.

thanks,

Louie