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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
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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.