Scientists and creationists are always at odds, of course.

Be able to confide your innermost secrets to your mother and your innermost fears to your father.

Be able to notice all the confusion between fact and opinion that appears in the news

Be able to live alone, even if you don't want to and think you will never find it necessary.

Know what to do if you feel faint or dizzy, especially if you might fall and hit your head.

Know how to behave at a fine restaurant, which is a telltale measure of social maturity.

Know which officials are voted into office and which are appointed, and by whom.