The Difference Engine was an accurate mechanical calculator designed by Charles Babbage in the 1840s, but was never built in its inventor's lifetime. Here, its modern builder explains how it works. Time: 03:52 Author: wired
More at http://itv.com/xfactor - Brother and Sister team Same Difference bound in with mounds of energy - but is it too much for the judges? Time: 02:42 Author: TheXFactorUK
