In Breaking Bad Season 3 Episode 13, we see a flashback scene where Walt and Skyler check out the house they plan to buy.
The flat broker asks him about Sandia Laboratories and mentions to Walt that he hears "some pretty fascinating stuff goes on out there". Walt insists on buying a bigger house because they can afford it eventually.
We see Walt being confident and willing to spend. How does he end up being a Chemistry teacher and also lose his confidence? Is this because of his son having cerebral palsy or his regrets on leaving Gray Matter Technologies?