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New frog discovered in New York City
Why the 'Man in the Moon' faces Earth
Jilted fruit flies turn to alcohol
Fertilisers behind increase in N2O levels
Early Earth hazy one day, clear the next
Could air pollution be making us fat?
Frog skin protein may help fight superbugs
Electrotherapy dampens brain connections
Satellite images spot early settlements
Chemistry helps sperm find the right egg
Social butterflies find safety in numbers
Ibuprofen reduces altitude sickness: study
Mercury findings raise new questions
Megafauna collapse led to mega changes
New device invisible to magnetic fields
Travelling gnome answers weighty question
Study throws Moon theory up in the air
James Cameron reaches bottom of Pacific
Link builds between extremes and warming
Some chocolate-eaters have lower BMI
Dingoes, devils may be angels in disguise
Barefoot running less energy efficient
Dolphin males share human social network
Recycled spectacles twice that of new: study
Calls back evolutionary gender theory
Women speak to their male partners less often as they grow older and turn their attention to a younger generation, according to an unusual study.

The findings back evolutionary theory about the role of women in the survival of the genes, according to the probe by researchers in Britain, Finland, the United States and Hungary.

The investigators tracked the origin and destination of two billion mobile phone calls and text messages among 3.2 million people over seven months.

The changing web of contacts showed how men and women's social strategies mutate over time, according to the paper which appears in the journal Scientific Reports.

"This suggests that the intimate structure of human social networks are driven much more by women's interests than by men's," says Robin Dunbar from Oxford University's Institute of Cognitive and Evolutionary Anthropology.

"Men are more casual in their social relationships, whereas women know what their social goals are and go for them."

Women spent more time communicating with the opposite sex when they were of childbearing age, the scientists write.

After the age of 45, women tended to shift their attentions to a much younger female - presumed to be a daughter - as their focus shifted to grandchildren.

Men's most frequent contact throughout their lives was consistently with their wife or girlfriend, although they made fewer calls than women did.

Co-author Kimmo Kaski of Finland's Aalto University says the results were "maybe sort of obvious", but this was the first evidence borne out by actual data.

The researchers knew only the age and gender of the subjects, the duration of their calls and the number of messages sent, as well as their postal codes.

The information was provided by an unidentified phone company in a European country. Identities and other data were withheld.

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