Speaking

In person, except with my very closest friends, I generally donโ€™t say anything unless these two conditions are met:

1) I am 99% sure what I am saying is correct.

2) I can back up my argument with facts and citations.

Otherwise, why bother making mouth noises when you donโ€™t know something? It just wastes everyoneโ€™s time and harms the more gullible.