I just pledged $10 to help John Graham-Cumming build Charles Babbage 's analytical engine.
Babbage designed the analytical engine, a Turing complete computer in 1833, a 100 years before Alan Turing published his paper on the Turing machine. If you want to see this steam powered brass mechanical computer get built, pleas...e pledge and be a part of history!
pledge page http://www.pledgebank.com/babbage
More about Charles Babbage http://blog.jgc.org/2010/10/babbages-heart-warming-message-for.html