[Neoliberalnot]

No legal training. Chemist and bioscientist for a few decades.

Here’s an example of common knowledge, if one is facing north west is on your left. No need for a citation to convince most people since it is common knowledge.

[Garth Tater]

"Here’s an example of common knowledge, if one is facing north west is on your left. No need for a citation to convince most people since it is common knowledge."

Not if you're standing on the South Pole LOL

Seriously though, your simple example is irrelevant here as the subject we were discussing has no common, scientifically unchallenged base of facts. And arguing from common knowledge (actually common beliefs) is a logical fallacy in this case. As was your ad hominem and your argument from authority. If the facts are in dispute then arguing that "everybody knows" is a logical fallacy.

Did they maybe not teach logic back in your college days?