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Two points:

1) "Physics is like sex: sure, it may give some practical results, but that's not why we do it." - Feynman

Most smart scientists and engineers I know (not just web programmers) work on their problems due to some combination of: they enjoy the problem, they're scratching their own itch, they get prestige from doing the problem, and they make good money doing it. Even the ones that are working on "important" problems.

2) Sometimes it's hard to see the downstream effects of what we do. By improving ad targeting, maybe Google has enough cash to reinvest in something like self-driving cars, which ends up saving untold numbers of real lives in the future.

By spending time on planetary motion (seems pretty useless) in addition to alchemy (eternal youth and unbounded riches? clear winner), Newton has helped solve more "important problems" than anyone could dream to.

Summary: The incentives of people that work in science and engineering are generally far from altruistic. We don't really know enough about the impact of the stuff we do to be able to say what's important.




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