Well, *I* learned that calcium carbide..(the stuff that makes acetylene gas) does 'interesting' things when combined at random with other items on the chem lab's shelves.... I also learned how clean up those interesting results real fast.

But in college, I learned a bit about critical thinking in Philosophy classes, and though I only made $4000 as a grad student from all those classes, I can say I have used the basic concepts about what 'reason' involves for the last 40 years.
And...*sigh*...I also learned that sort of knowledge is not necessarily a popular item in some places.