[Hodar]

I think the problem you are having is one of academics.

In academics, everything is an exercise of looking up data on a problem that has a definitive solution - if you just know where to look.

In life, we have no idea what the answers are; so we invent them. This is 180 degrees out of phase with most academia. So, you have to modify your interview technique to screen the academics from the problem solvers.

I do this by asking questions that require thought. Such as “Name 5 reasons why a man-hole cover is round”.

[Constitutions Grandchild]

Oh, that’s simple. It’s because the man-hole is round. Do I get a prize?

[Centurion2000]

I do this by asking questions that require thought. Such as “Name 5 reasons why a man-hole cover is round”.

Circular plates are the absolute cheapest in terms of material required.

Manholes that are circular cannot fall into the hole. (all other shapes can)