Testosterone Gives Male Birds Their Color, Scientists Say
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High levels of testosterone may explain why strong male birds have it all: great singing, beautiful plumage, and a macho immune system.
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Scientists successfully inject male monkeys with a protein that renders the chimps temporarily infertile. The research may provide a new birth-control option for men in the next decade.
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An artificial version of the pigment that gives tomatoes their colouring could help treat prostate cancer, say researchers.
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Oct. 27, 2004 -- A new study hints at why forgetfulness plagues older men. Loss of testosterone, which happens normally as men age, seems to be at the root of some memory loss.
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Obese men often experience a sharp decline in testosterone levels while obese girls show much higher levels of the sex hormone than girls of normal weight, according to scientific research released on Monday.
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Young women with low libido had good sex more often after using a testosterone spray, Australian researchers said on Thursday.
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Now, researchers are pointing to a promising new method -- a shot that prompts an immune reaction to a protein produced in the male reproductive system.
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A form of intersex fish, which have both male and female traits, were found more often by researchers in areas with more farming and population density, according to a new study by the U.S. Geological Survey.
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Men with deep voices have more children, probably because they attract more mates, the lead author of what is said to be the first study to examine the relationship between voice and number of offspring said Tuesday.
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Chameleons evolved the ability to flash bright colours to show off, not to blend in, scientists say.
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Young men drive fast because speed is perceived as inherently male, a team of Swiss and German researchers claimed in a study released on Monday.
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Study bolsters theory about interference with production of key hormone.
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Men with chronic obstructive pulmonary disease (COPD) -- which includes a number of lung problems such as emphysema that make breathing difficult -- may benefit from an extra dose of testosterone, a new study indicates.
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High levels of testosterone in foetuses are linked to a higher chance of developing autistic traits, scientists say.
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It&#39;s been decades since scientists formed the belief that testosterone therapy could spur increased sexual desire in women. Now researchers think they have a reliable way to deliver the testosterone
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Too much testosterone can kill brain   cells, researchers said on Tuesday in a finding that may help   explain why steroid abuse can cause behavior changes like   aggressiveness and suicidal tendencies.
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To shed light on the secretive sex lives of rosy-finches, birds that nest high in the Rocky Mountains, researchers clip on crampons and get climbing.