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Can finger ratio predict who’s a nice guy?
New research links men’s finger length ratios with their behavior, especially while interacting with women. Men’s index fingers are generally shorter than their ring fingers. The difference is less...
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Ancient ‘sex switch’ comes out of retirement
Scientists have brought a retired sex gene in mammals back to life—proving it can still switch on male development in mice, despite not having done so for millions of years. The gene Dmrt1 is no longer...
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Female chimps do more hunting with tools
In 2007, Jill Pruetz first reported savanna chimps at her research site in Fongoli, Senegal, were using tools to hunt prey. That was big news, but what also stood out to Pruetz was that female chimps...
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BPA trumps temperature to decide turtle sex
Bisphenol A, a chemical used in plastics that mimics estrogen, can alter turtles’ reproductive systems and disrupt sexual differentiation. Scientists are concerned that the findings could indicate...
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Bigger isn’t better for baboon rear ends
Biologists have long thought that baboon males prefer females with bigger backsides as the mark of a good mother, but new research suggests it isn’t so simple. A study of wild baboons (Papio...
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Can catalysts protect fish from birth control?
Catalysts effectively and safely remove a potent and dangerous endocrine disruptor from wastewater. In Scientific Reports, the research team of Carnegie Mellon University chemist Terrence J. Collins...
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Bad economy leads parents to favor daughters
When a family finds itself in tough economic times, parents are likely to be more financially generous to a daughter than to a son. And the reason has to do with something parents often tell their...
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Male koalas would rather yell than fight
Male koalas let out distinct bellows to avoid confrontation with competitors, according new research on their love lives. Researcher Bill Ellis and colleagues have mapped what they believe to be the...
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Why men don’t live as long as women
Around the world, women can expect to live longer than men. Why? And was this always the case? According to a new study, significant differences in life expectancy between the sexes first emerged as...
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Is science pretending both sexes have the same brain?
Neuroscientists have found a key molecular difference between males and females in how synapses are regulated in the hippocampus. The findings suggest that female and male brains may respond...
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Add ages and sexes to locate health risks
A new book offers a way to identify when specific traits—like height or language ability—are more vulnerable in either of the sexes or at particular ages. Historically, males have been considered the...
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How to improve the gender question on surveys
Surveys with only one question and two possible answers for gender may not measure what their creators want to know. Stanford University sociologist Aliya Saperstein says survey questions involving sex...
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Estrogen tilts sex ratio of frogs in the suburbs
A new study shows that estrogen in suburban yards is changing the ratio of male and female green frogs at ponds in southwestern Connecticut. Higher levels of estrogen in areas where there are shrubs,...
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Why there are way more guys in the media
Five out of every six names in the media today are men’s, report researchers. In fact, the more the media mention someone, the higher the chances are that the person is a man. The researchers combed...
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Female cells use RNA to turn off X chromosome
Males have an X and a Y chromosome inside each cell, and females have two X’s. This small difference explains why males are more at risk for a range of disorders—from autism to hemophilia—linked to...
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Law expert: A.C.A. needs anti-discrimination rule
The US Department of Health and Human Services is considering adoption of anti-discrimination regulations that would apply to all health care providers and build upon the Affordable Care Act (ACA)...
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‘Supergene’ decides how these birds get a mate
Male wading birds called ruffs have striking mating behaviors—and new genome sequencing shows which genes are responsible. Individual animals usually exhibit flexibility in their behavior, but some...
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Why winter days get female hamsters all riled up
Researchers have discovered a hormonal mechanism in hamsters that connects short winter days with increased aggression in females and differs from one that controls the same response in males. The...
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Insurance for sex reassignments is cost effective
Insurance coverage of sex reassignment surgery and hormones for transgender men and women is cost-effective, a new study suggests. The analysis calls into question the policy of many US health...
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Oxytocin might raise, not lower, anxiety in women
Oxytocin, a hormone that plays a role in intimacy and social bonding, is being investigated as a treatment for anxiety, depression, and PTSD. But a new study with mice raises important questions about...
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