Of the century? We're not even a quarter of the way through. One could've ventured a guess as to the most important scientific achievement of the century in the

Of the century? We're not even a quarter of the way through. One could've ventured a guess as to the most important scientific achievement of the century in the early 1920s but would miss the discovery of penicillin, the invention of the computer, the invention of the transistor, the eradication of smallpox, etc.