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Studies show that laboratory mice can smell too-similar MHC in the urine of other mice and will avoid mating with those individuals. In later work conducted at the University of Bern in Switzerland, human females were asked to smell T shirts worn by anonymous males and then pick which ones appealed to them. Time and again, they chose the ones worn by men with a safely different MHC. And if the smell of MHC isn't a deal maker or breaker, the taste is. Saliva also contains the compound, a fact that Haselton believes may partly explain the custom...
...knowledge. A lot of those benefits come down to stress--or, specifically, the management of it. Stress puts into motion a biological cascade involving hormones, glands and neural circuits, all activating one another in a complex feedback loop. When you are stuck in traffic or overwhelmed at work or worn down by the kids, the hypothalamus--a structure buried deep in the midbrain--tells your adrenal gland to pump out a supply of the stress hormone cortisol. Cortisol, in turn, tells your body to stop worrying about its basic metabolic needs and instead to "do the things you need...
...concert with anyone who's paying attention to them. Smiling is a critical and cleverly timed part of this phase. Babies usually manage a first smile by the time they're 6 weeks old, which, coincidentally or not, is about the time the novelty of a newborn has worn off and sleep-deprived parents are craving some peace. A smile can be a powerful way to win them back...
...Studies show that laboratory mice can smell too-similar MHC in the urine of other mice and will avoid mating with those individuals. In later work conducted at the University of Bern in Switzerland, human females were asked to smell T shirts worn by anonymous males and then pick which ones appealed to them. Time and again, they chose the ones worn by men with a safely different MHC. And if the smell of MHC isn't a deal maker or breaker, the taste is. Saliva also contains the compound, a fact that Haselton believes may partly explain the custom...
...Harvard freshman’s schedule already has at least one semester of expository writing in it (some have two). What’s more, many of our campus’s newest inhabitants are worn out from their high-school language experience or unsure of what new tongue to take up next. This unique dilemma, and the grumbling that follows, is created entirely by the haphazard, bureaucratic rules in place that stifle a welcoming intellectual environment. In the spirit of cultivating curious, focused minds, Harvard should trust its students to make their own informed, reasoned choices from among...