they could bring the water by irrigation. so the first sign of agriculture is cutting irrigation channels. >> they took control of the situation because they had to. and thus came irrigation. here's one thing for your monogamy assertion. >> all right. >> according to peggy vaughn, who wrote "the monogamy myth." maybe a counter book to your sex at dawn. >> sure. >> 60% of husbands, ladies plug your ears, 60% of husbands and 40% of wives will have an affair before their marriage completes itself. however the marriage completes itself. does that dispute your entire theory of monogamy when people aren't monogamous? >> not at all. not at all. our theory is that monogamy does