Lego has had a product called NXT for a while now that is capable of some quite complex things.  Now the guys at Lego Engineering have started a series where they look at a real world problem and then attempt to solve it using the Lego NXT system.  In this article they look at the process of clearing blood clots using ultrasonic vibrations.

I always enjoyed playing with Lego.  Interesting to see how it's evolving.