I've only heard Cro-Magnon with the hard 'g'--but for years I'd only heard Uranus with the stress on the second syllable for years. Then about, oh, fifteen years ago I learned that astronomers stressed the first syllable. That pronunciation is now well-established around here in the schools, although many hold onto the older pronunciation I grew up with.

Cap, clever play on words there. Disturbing, but clever.