system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] So what are Banner's Seven PHDs in?

so in Ragnarok he mentions having seven PHDs, which is a better explanation than the usual movie trope of scientists just being brilliant at everything.

So what are they in?

Nuclear Physics certainly, plus some biological or medical field given how he was treating patients in India, what else?
gpt
Not flying spaceships.

The funny thing is that multiple doctorates would be redundant.  Once you've got your first one, you've earned the privilege to follow your own research.  You could theoretically write your dissertation on nuclear physics and wind up studying insect digestion.  

PhD's aren't trade school certificates - they're a license to direct your own course of study.  You've proven that you know how to do research and follow through to publishing completed studies.