They have rubber teeth. Pauline repeated this information in a geography lesson and found herself the laughing stock of the class. That was how she learned that a man, even if he is your own father, would rather make up an answer than admit to his ignorance. For him answering is a game, and not knowing what he's talking about just adds to the thrill. Expressing skepticism can be highly inflammatory.
Many women actively encourage male answering behavior.
Women who behind closed doors expound eloquently on particle physics may be found, in male company, gaping at the news that the earth is round. Since killing wooly mammoths and attacking enemies with rocks are now frowned upon, and since shirts open to the navel are not appropriate in every social situation, men prove their masculinity by concocting elaborate theories about football. Growing awareness of MAS has led some to call for a moritorium on all male-female conversation. This is alarmist. But care should be taken.