So you want to know about my education? Here's the short form:

Question: "Why are manhole covers round?"

Cognitive Science (MIT) answer: "They only appear round - they're actually cylindrical."

Mechanical Engineering (MIT) answer, year one: "Because that's the only cover shape that can't turn sideways and fall in." (nope - extra points for the counterexample proof).

Mechanical Engineering (MIT) answer, year two: "Hoop stress." (good guess, but still wrong).

Social Science (Stanford) answer: "Because all the other manhole covers are round."

Architecture (Berkeley Extension) answer: "Because manholes are round."