I disagree that all the "low hanging fruit" is gone, mostly because an obvious discovery is usually only obvious in retrospective.,(reply>), @plovet We now know about things so small, our eyes can't see them even with massive lenses to help. We can manipulate the very matter that makes us, we are starting to read brains and create our own. We know about distant space and structures so large no single human can comprehend them. Our tools to learn new things need tools built to build the tools we use to make them. I'd say it's fair to believe the low hanging fruit is gone.,(reply>), @plovet I mean, the last 150 years of scientific discovery have all been fairly... not-simple<br>In physics, for example, we moved to quantum mechanics, general relativity and the standard model. None of which is particularly intuitive,(reply>), I'm certain there is still "low hanging fruit" to find. We just don't recognize it. It only looks easy, AFTER you understand it. We don't know what we are looking for. It only appears to be easy "low-hanging fruit" with hindsight and knowledge. Believing that we have "finally" discovered everything 'easy' is nonsense .... everyone in history thinks that, until the next big discovery comes along. Progress will happen, and the biggest discoveries will look "easy" with hindsight.