Adam Turkelson dug up this awesome project to build a binary adder machine using marbles, and I couldn't resist posting it.

It's an awesome machine, and there are some really ingenious hacks to make the while thing work almost flawlessly. It's worth reading the whole description to get a real idea of the iterative revisions it takes to build something like this, and all of the small details it takes to make it so robust.

The builder, Matthias Wandel also has a ton of other nifty woodworking projects on his page, including some designs by other people. In fact, I was kind of surprised that I didn't see any of Bradley Litwin's machines posted on there.

You know what they say Give a man a computer, and he will compute for a day. Give a man woodworking tools, and he will compute for a lifetime. Or something like that.