Invention #4 LED
When the LED was invented in 1962 it was predicted to eventually replace the common light bulb. It’s fair to say it’s well on the way to do just that. When it was suggested the inventor, Nick Holonyak Jr, should receive a Nobel prize for this extremely useful invention, he is quoted as saying “It’s ridiculous to think that somebody owes you something. We’re lucky to be alive, when it comes down to it.” So no millionaire lifestyle for him either.