Theory of low-dimensional semiconductors and many other theories underlying modern computers were largely incomplete or non-existent 100 years ago, general rela

Theory of low-dimensional semiconductors and many other theories underlying modern computers were largely incomplete or non-existent 100 years ago, general relativity isn’t that old either and there are substantial gaps in the extremes (e.g. huge masses/curvatures on the quantum scale), there’s definitely stuff lurking there waiting to be discovered. Just because we kno a lot doesn’t mean we know everything, there are ridiculous gaps in our understanding e.g. mass-energy density of the universe, I expect our understanding of the world to fundamentally change again this century, maybe more than once.