I'm thinking of directing a part of my stack towards self development, or in other words: A study.
Not now, not tomorrow, but there'll be a time that I'll opt to do something with the money; a part of which I'd like to put towards a study which provides value beyond the monetary part- it'll has to bring something to the table on a personal and societal-level, too.
The only question is: what fields / jobs qualify for the above (in your opinion)?
What will be relevant / be of use in, say, 10 - 20 years from now?