It has become almost a cliche to remark that nobody boasts of ignorance of literature, but it is socially acceptable to boast ignorance of science and proudly claim incompetence in mathematics.
I'm always active in trying to educate people when it comes to eating animal products, testing on animals, and the health benefits of being vegan, although I'm probably not the best person to be talking about the latter at the moment.
And of course we are familiar with the English common law rule of thumb that said a man could in fact use a stick no bigger than his thumb to discipline his wife and family.

