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27 November 2013 12:59 pm ,
Vol. 342 ,
The new head of the National Center for Science Education promises to "fight the good fight" against attacks on...
Analyses of the H7N9 strains isolated from four new cases show that the virus is evolving rapidly, heightening anxiety...
In 2009, Jack Szostak shared a Nobel Prize for his part in discovering the role of telomeres, the end bits of...
Science has exposed a thriving academic black market in China involving shady agencies, corrupt scientists, and...
Paper-selling agencies flourish in the aura of reputable businesses. For some scientists, it may be difficult to tell...
Featuring the first lunar rover in 40 years, Chang'e-3 is seen as an important milestone on China's quest to send a...
Data collected by satellites and floating probes have chronicled a 2-decade rise in the temperature and thickness of a...
Cholesterol, the artery-clogging molecule that contributes to cardiovascular disease, has another nasty trick up its...
- 27 November 2013 12:59 pm , Vol. 342 , #6162
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ScienceShot: The Downside of Manliness
8 December 2010 6:00 pm
Like many male primates, male chimpanzees compete to establish dominance—and decide who gets more access to females. Higher-ranking chimps have more testosterone, which is associated with aggression. But testosterone isn't necessarily healthy. For example, it suppresses the immune system. Researchers watched 22 male chimps in Kibale National Park in Uganda, waited for them to poop, and collected fresh fecal samples. From each sample, they extracted two useful pieces of information, they describe in BioPsychoSocial Medicine: How much testosterone the chimp had and how many species of parasites lived in his gut. Higher-ranking males had both more testosterone and more parasites, possibly because the testosterone suppressed their immune system. So females may be impressed not only by a male's manliness, but by his ability to withstand the excess onslaught of parasites in his gut.
See more ScienceShots.