keach: in a test pit, the team looks for buried structures. do still more houses lie beneath the sugar cane ? after days of digging, the test pit is three meters deep. the workers have found a large piece of wood. it may be the remains of a roof timber. ¿qué han encontrado? ahí está. ¿en la esquina? no. eso no. acá. aquí está. ahí. iotro grande! keach: using the test pit method, the team finds evidence of at least seven buried structures. right there. keach: full excavation begins. slowly, meticulously, the team begins to remove the volcanic ash. weeks later, the ancient floors emerge, yielding the first clues of how these rooms were used. so, anyway, we're really glad to find this. it's certainly not any one of your super-elegant, towering pyramids like at tikal, but, for our purposes, super important to know where they actually did their cooking. and they've got round-bottom pots. and what they'd do is they'd rest one of those round-bottom pots on the three points of contact and put the firewood in from the side. the people in the area still

keach: nopal still grows just outside the cave. macneish's workmen remember droughts when they ate nopal to stave off hunger and thirst. they call the cactus "starvation food." so, discovering cactus in the cave tells the archaeologists it was occupied during the dry season when both food and water were scarce. pretty good, not bad. needs a little sauce. the most precise evidence that this was a dry-season camp is a tiny, hollow bone. interpreter: this is the bone of a bird, perhaps a duck, which migrates to this region each year only in the winter during the dry season. all this is evidence of the food that they had in this cave and indicates that it was occupied in the dry season in autumn and winter. keach: until recently, another living culture was still following a nomadic way of life. these are the kung bushmen of south africa. they provide some clues as to what daily life might have been like in the ancient tehuacan valley. [ thunder ] in the rainy season, the desert blooms. the men hunt and the women gather nuts and berries

>> i said, get out of here, keach keep it moving! the health issues that you experienced. first of all, the cancer. secondly, as a result of the chemotherapy you had, something that i can't pronounce? >> myelodystplastic syndrome. mds. >> jimmy: mds. >> i think i would be just the worst. i would be terrible. i would handle it so poorly. >> what do you think you would do? >> jimmy: order everyone out of the room just don't come back. i would be miserable in the hospital. how long were you in the hospital? >> i was in the hospital for 30 days. in isolation. i had something to keep me warm. i had a hoody from you that you sent me. >> jimmy: that's right. i have to say, i was -- to be honest thrilled when i saw this photograph of you wearing our -- our apparel. >> yeah! [ applause ] >> jimmy: that its a lot of machines though. >> winged out my iv pole. a disco pole. if you are going to have the thing next to you. might as well be a disco and a party. >> jimmy: next to you 30 days, huh? >> i have to say my sleep pattern was a little diffe

the reason we keach such a healthy loan ratio is because it's been argued we make risky loans. we loan to places nobody else will go. we just made a commitment to ukraine and we were the first ones to make a commitment of $3 billion. there is risk in what we do. you do have to keep a very healthy equity to loan ratio in being able to ensure you won't default or get in trouble. the question is how halty -- healthy does it need to be? we can go less than 28% equity to loan ratio and still have a very good institution and not get in trouble. >> do you care about getting paid back? >> of course we do. here's why. when we talk about our market rate loans, the loans we provide to india, china and other places, it's about 50 basis points. >> cheap. >> we borrow minus 25 basis points, something like that. so the spreads just are not that great. we think when we provide a loan at those rates, it's part of the responsibility of those countries to us as an institution to make sure we get paid back. >> let's take questions from the audience. and we'll take some from new york as well. gentl