Penicillin, maybe? But I wonder how quickly it became readily available outside of the Western world.

And I see that Nintendo has apparently sold an extremely impressive number of consoles (https://www.nintendolife.com/news/2019/11/nintendo_has_now_s...). But even if everyone only bought one console each, that's only about 10% of world population.

This may be a little unfair, but I do wonder if there isn't a tendency to consider a technology to be widely available when it becomes available to you and the folks farther back in the line don't count or aren't relevant.