Well, you could start (for example) with these lists of unsolved problems in physics[1] and math[2]. I'm sure similar lists exist for every science. Of course

Well, you could start (for example) with these lists of unsolved problems in physics[1] and math[2]. I'm sure similar lists exist for every science. Of course, private industry is interested in funding research in to next to none of them (at least not nearly to the extent that it is in problems that have immediate profitable applications). [1] - https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_physics https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_p... [2] - https://en.wikipedia.org/wiki/Unsolved_problems_in_mathematics https://en.wikipedia.org/wiki/Unsolved_problems_in_mathemati...