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I don't know about where you live, but in Norway you have to study and do research and write fo a total of 7 years to be a professor. That's a lot in and of itself. Second of all, maybe it's just the thing that they devote their life to science, to always learn more? You say "aside from the 10% that to world changing research" implying that that's the only research that matters. Yet at the same time I'm sure you have a lot of respect for Stephen Hawking right? Even though none of his research is world changing. It has no implications on our daily life, and likely it never will. All it does is help us gain knowledge about the universe we live in, which is valuable in and of itself.