Every once in a while I run across someone’s personal web site that keeps me coming back. Matthias Wandel has one of those web sites that is not only entertaining, but educational. And he comes up with some crazy contraptions to solve some practical problems.
One such example is his Pen-Shaking Centrifuge. You can see it in action here:
This web page steps you through all the details of how he went about designing and making the device.
I wish I had half the creative genius and time to tinker like Matthias.