keach: archaeologist william sanders has been leading excavations in the copan valley since 1980.e decided to do a series of large-scale excavations out in the countryside to get an idea what the farming population was like. what kind of houses did they live in ? what was their lifestyle like ? probably 80% of the population of copan was in that social category. keach: unlike ceren, the ancient houses of copan had been exposed to centuries of erosion. very few artifacts remained intact or in their original location. still the team finds significant clues. in one structure, the team discovers a razed platform of stone, the remnants of a sleeping bench. in another, they find evidence for a kitchen -- shattered obsidian blades that once were knives and broken pieces of pottery that were once used for cooking. the layout of ancient maya houses is quite different from our own. the maya constructed separate buildings for sleeping, cooking and storing food. they organized these buildings around patios. after two seasons of work up here, what can we say ? we have almost fully excavated a

archaeologist william sanders. the economy of any given human group, any culture, is a powerful factor that affects the rest of that culture -- the social organization, the political institutions, even the ideology, the religion of a people. from my perspective, the economy of a group is one of the most powerful determinants of human behavior. keach: to archaeologists, all economies fall somewhere on a spectrum from simple to complex. in a simple economy, people grow or gather all the food they eat. they make all the things they use. households in such simple economies are almost completely self-sufficient. at the other end of the spectrum are highly complex economies in which people specialize in one particular job, like these shoe salesmen in morocco. specialization means people are no longer self-sufficient, but depend on each other. the shoe salesmen are dependent on the shoemakers, and the shoemakers are dependent on the tanners, and so on. this dependence on others makes society in general more complex, so sp

third quarter, williams is dialing long distance. 67 yards to ricky sanders. and another one-yard touchdown plunge. skins up 24-10. >> basically came and did a great job. the man on the town. >> the dream scenario for doug williams turns into a nightmare in the fourth quarter. reggie white with the blindside hit, but this time reggie comes up with the ball and the big man can move. check him out. he rolls 70 yards after three quarters, and a reggie white touchdown, we're tied at 24. but this day belonged to doug. on the ensuing kickoff, it's keith griffin. he brings it in at his own 7 yard line and cuts right through the middle of the mayhem. break left and sets up the skins on the eagles' 39 yard line to end the third quarter. next play, and doug does a perfect toss to art monk right in stride. it's a 39-yard hookup. skins win it 34-24. >> once the coaches evaluate the situation, like jay went down, we've got to have doug williams come in. we've got to realize, this is not a team that's rebuilding, this is a team that's reloading. we're trying to go to the sup