Comment by umvi

Some professors are humble though.

I had a Physics 101 professor who gave a test that had a problem involving blowing a fan into a sailboat sail. The answer to the question was supposed to be that the sailboat doesn't move anywhere because of Newton's 3rd law, but one guy in the class spent close to the entire exam on that one problem showing that it would slowly move forward using a conservation-of-momentum-based approach instead of a Newton's 3rd law approach. The TAs marked it wrong and he got a low score on the test because he spent so much time on that one problem. He tried to argue about it to the professor in lecture but the professor shut him down saying to come discuss it during office hours. So he made a demo using a pinewood derby car with a hand fan glued to it and brought it to office hours and proved that it would move forward. The professor was super humble about it and brought the demo to lecture the next day and publicly gave kudos to the student for challenging the status quo.