Smack Me on the Head With a Shovel

Watching d30 at play (better in the video below) is like watching anybody play with Silly Putty. The explanation given (again, explained in the video below) is that the "intelligent molecules all band together upon impact...[to] absorb the shock and get hard."

Sounds like a pretty cool material and one that I need to get my hands on a sample of. Maybe a trip to Play-It-Again Sports is in need, 'cause this is a material I need to get my hands on.