Shrdlu resurrection – A 1970 artificial intelligence system
semaphorecorp.com
semaphorecorp.com
Plus look at the list of people discussed on that page, Henry Baker, Dave McDonald Vaughn Pratt, Tom Moran, Stu Card and many more...not bad for what turned out to be a false step.
I think it's still important to know about the Michelson-Morley experiment even though nobody believes in luminiferous aether any more. OK, SHRDLU isn't as earthshaking (so to speak) as the M-M experiment, but then again, AI was (is) still in the alchemy phase in the late 60s.