Read the following scenario and determine who has the absolute advantage and who has the comparative advantage.
ruth and sam are roommates. ruth is not only an amazing chef, but she's also exceptionally fast at cleaning. however, ruth is always too tired after cleaning to cook. sam, on the other hand, is a mess in the kitchen, and while she can clean speedily, can't clean as fast as ruth. however, she can often get the cleaning done in the time it takes ruth to cook a meal.
a. ruth has an absolute advantage in cleaning, and sam has an absolute advantage in cooking.
b. ruth has an absolute advantage in both cleaning and cooking, but sam has a comparative advantage in cleaning.
c. sam has a comparative advantage in cleaning, and ruth has a comparative advantage in cooking.
d. sam has a comparative advantage in cooking, and ruth has a comparative advantage in cleaning.

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.

one way archaeology us understand the past is through the material objects it finds, allowing us to know what was being used, and when. for example a dig recently found a flute, believed to be the oldest musical instrument found to date.

i hope this