mplete any of his machines, but in the 20th century a dedicated band of enthusiasts built a working model of Difference Engine No.2. One copy sits in the London Science Museum and another in the Computer History Museum in California. These difference machines are not Turing complete and his Analytical Engine has never been

anity.” While ona book tour in London, he was in the midst of planning for FLI, and he admits being driven to tears in a tube station after a trip to the London Science Museum, with its exhibitions spanning the gamut of humanity’s technological achievements. Was all that impressive progress in vain? FLI’s scientific adviso

anity.” While ona book tour in London, he was in the midst of planning for FLI, and he admits being driven to tears in a tube station after a trip to the London Science Museum, with its exhibitions spanning the gamut of humanity’s technological achievements. Was all that impressive progress in vain? FLI’s scientific adviso