Chimps live in a male-dominated society, where most of their valuable partners are other males. However, as young male chimps become adults, they continue to maintain tight bonds with their mothers, a new study finds.

“The dramatic changes of adolescence are difficult for chimps, just like they are for humans,” says Elizabeth Lonsdorf, an expert on primates (灵长动物) at Franklin&Marshall College who was not involved in the study. “Sure enough,” she adds, “their moms remain a key social partner during this time.”

Previous research has shown chimp mothers provide their sons with support that goes far beyond nursing. Young male chimps that are close with their moms grow bigger and have a greater chance of survival. What’s more, losing their mothers after weaning (断奶), but before age 12，gets in the way of the ability of young chimps to win other males and reproduce.

To see whether this bond extends later into life, researchers followed 29 adolescent (9 to 15 years old) and young adult (16 to 20 years old) male chimps at a research site in Kibale National Park in Uganda and observed them from a distance for 3 years. The team found that the young adult males spent less time with their mothers than the adolescents did—26% vs. 76%. As the male chimps grew older and more independent, they began to travel over wider ranges and spent more time away from their moms.

However, when these young adult males happened to be in the company of their mothers, they acted just like the adolescents. They groomed (梳理) their moms just as often and kept track of them. “Many mothers remained the males’ ‘best friends’ or ‘social partners’ they associated with most frequently,” says study co-leader Rachna Reddy from Harvard University.

Such persistent ties are also common in humans after sons leave their mothers and live on their own—especially in tough times, Reddy says. “We really feel what it’s like to not be able to see our mothers when we want to in tough times. The importance of those bonds in our lives and the comfort we get from them have deep evolutionary roots.”

Britain's got talent——but we're still wasting it. That's the main finding of a new report by researchers from Oxford University. Children of similar cognitive (认知) ability have very different chances of educational success； it still depends on their parents' economic, socio-cultural and educational resources. This contradicts a commonly held view that our education system has developed enough to give everyone a fighting chance. The researchers looked at data from groups of children born in three decades: 1950s, 1970s and 1990s.

They found significant evidence of a wastage of talent. Individuals with high levels of cognitive ability but with disadvantages in their social origins are unable to translate their ability into educational achievement to the same extent as their more advantaged counterparts (对照组). The research, funded by the Nuffield Foundation, found that only about half of the difference in educational achievement between children from advantaged and disadvantaged parental backgrounds is due to differences in their cognitive ability. The other half is due to other factors (因素)associated with their backgrounds.

“If we compare the educational achievement of children born in the 1990s to those in the late 1950s and early 1970s, we see that parents' economic resources have become a less important factor, but their socio-cultural and educational resources have grown in significance," says Dr. Bukodi. “That means that your parents' place in society and their own level of education still play a big part in how well you may do."

These experts are now calling for policy-makers to acknowledge that formal qualifications is only one channel for upward mobility (流动性)for high-ability individuals of disadvantaged backgrounds. Dr. Bukodi says, “These findings show that there are limits to how far inequalities of opportunity can be reduced through educational policy alone. Changes in educational policy aren't having the powerful effect we want."