Capitalist bootlickers be out there telling you to study shit to boost your ability to do your job, and here I am studying Lie Group and Algebras and how to use Prolog because I fucking want to, even though they're completely *useless* to me as a healthcare professional.
Miss me with that productivity bullshit. Me and my myriad of interests don't have time for that.
Basically, learn whatever makes your life and other people's lives better, not what some capitalist or bootlicker thinks you should learn to make you more "productive".