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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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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.