منابع مشابه
Why Do Men Hunt ?
The role of men in hunter-gatherer societies has been subject to vigorous debate over the past 15 years. The proposal that men hunt wild game as a form of status signaling or “showing off” to provide reproductive benefits to the hunter challenges the traditional view that men hunt to provision their families. Two broad assumptions underlie the signaling view: (1) hunting is a poor means of obta...
متن کاملWhy do men marry and why do they stray?
Humans are quite unusual compared to other great apes in that reproduction typically takes place within long-term, iteroparous pairings--social arrangements that have been culturally reified as the institution of marriage. With respect to male behaviour, explanations of marriage fall into two major schools of thought. One holds that marriage facilitates a sexual division of labour and paternal ...
متن کاملWhy do men have nipples?
Every day the home page of my internet service offers a selection of trivia including news of celebrities who are either sleeping with each other or splitting up. There is also usually an item of popular science, often packaged as ‘the latest research’. If one of these catches my eye I sometimes click on the link to read it in more detail. Two items I recently followed up in this way were heade...
متن کاملHow Fast Do Old Men Slow Down?
Abrtmcr-An important question in the study of aging concerns the rate at which people physically deteriorate with age. HOW much, for example. CB~ be physically expected of, say, a healthy, non-injured 75.year-old man or woman relative to what be or she could do at ape 4% This paper applies econometric techniques to data on men’s track and field and road racing remrds by age to estimate the rate...
متن کاملWhy Do Healthy Men Experience Morning Erections?
People begin the sleep cycle with a period of non-rapid eye movement (NREM) sleep, followed by a very short period of rapid eye movement (REM) sleep. During a normal night of sleep, humans usually experience about four or five periods of REM sleep. Penile erections have generally been considered to be an epiphenomenon of REM sleep-related physiological changes for healthy males. Thus, men are v...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1915
ISSN: 0036-8733
DOI: 10.1038/scientificamerican07171915-63