The pre-shrunk 100% cotton Mass Times Acceleration T-Shirt for those of you who love science. And the fact that some people will read this shirt and find themselves perplexed. Sad to say it, but I did! And this isn't even a new joke. Whoops! Oh well, guess I'm not up on my basic science terminology... better re-take that 7th grade science class to brush up on my skills. In the meantime, I'll just wear my Mass Times Acceleration T-Shirt, cause now I know that Mass X Acceleration = FORCE! Like the rest of the shirt didn't give it away. ** Shakes head with shame **