Dr. Bramble, meanwhile, was working a little higher up the evolutionary ladder with big cats. Hediscovered that when many quadrupeds run, their internal organs slosh back and forth like water ina bathtub. Every time a cheetah鈥檚 front feet hit the ground, its guts slam forward into the lungs,forcing out air. When it reaches out for the next stride, its innards slide rearward, sucking air backin. Adding that extra punch to their lung power, though, comes at a cost: it limits cheetahs to justone breath per stride. When Shaggy realized what was going on, he felt a sudden pang of affection. They鈥檙e not gods, herealized. They鈥檙e just guys. And like every guy, the thing they loved most could bring them themost misery and confusion. Running a hundred miles wasn鈥檛 painless for the Tarahumara, either;they had to face their doubts, and silence the little devil on their shoulder who kept whisperingexcellent reasons in their ear for quitting. 黄色视频网站 Chapter 31 Lieberman was a scientist who believed that being hands-on meant being prepared to soak them inblood. For years, Lieberman had organized a Cro-Magnon barbecue on a Harvard Yard lawn aspart of his human evolution class. To demonstrate the dexterity necessary to operate primitivetools, he鈥檇 get his students to butcher a goat with sharpened stones, then cook it in a pit. As soon asthe aroma of roasting goat spread and the post-butchering libations began flowing, homeworkturned into a house party. 鈥淚t eventually evolved into a kind of bacchanalian feast,鈥?Lieberman toldthe Harvard University Gazette.