the anastazi were always moving. the whole thing about the disappearing anastazi, you go to where they are living and they disappear all of a sudden. but you follow them and find, oh, 10 years later they are over here and 70 years later they are over here. they are often being driven by these climate changes which on the colorado plateau, very small changes make you go. if you lose one inch of precipitation in one year, you got to get up to the mesas where there's a little more rain and then when the frost comes in too early, you got to get down to the desert. around 1276 or so the water was running out, the seasons were no good, and i think they just looked at their trade routes and said let's follow these and go south. they were always getting pushed around by the environment. . >> okay, thank you, craig, so much. thank you for coming. craig is happy to take some more informal questions in back and of course his book, house of rain, is available for sale in back too. thank you so much and thank you, craig childs. *