Researchers studying aging male chimpanzee relationships have gathered evidence that chimps narrow their friendships to only the most valuable relationships over time. This research is an interesting ...

Some friendships are simply one-sided. This woman and her best friend had been close since middle school. But through the years, she never felt like her friend reciprocated her efforts. So she doesn’t ...

More than three dozen candidates for Portland City Council and two mayoral candidates made at least 10 contributions to other candidates that were reciprocated, according to data from the city’s ...