- https://www.quantamagazine.org/a-math-puzzle-worthy-of-freem...
- https://old.reddit.com/r/Physics/comments/21h1xv/freeman_dys...
On the other hand, i myself feel that, if you have the mental inclination and can afford to do a PhD, one should do it. It gives you a greater probability of actually contributing to Humanity's collective knowledge base.