Fewer than 10 percent of all mammal species are monogamous. In fact, biologists have long disagreed over why monogamy exists at all. That's the subject of two studies published this week — and they come to different conclusions.
Animals that leave the most offspring win the race to spread their genes and to perpetuate their lineage. So for most mammals, males have a simple strategy: Mate with as many females as possible.
"Monogamy is a problem," says Dieter Lukas, a biologist at Cambridge University. "Why should a male keep to one female?"
With a vote of 93-1, the Senate confirmed James Comey as the next director of the FBI. Comey will replace Robert Mueller.
NPR's Carrie Johnson filed this report for our Newscast unit:
"Comey is a Republican and a former Justice Department official during the George W. Bush years. Civil rights groups questioned his record on surveillance and harsh interrogation of terrorism suspects.
"But after Kentucky Republican Rand Paul lifted his hold on the FBI nominee, Comey sailed through the full Senate.
The nation's first black public high school, Paul Laurence Dunbar High, opened its doors in Washington, D.C., in 1870. But more than 140 years later, Dunbar — like many urban schools — has fallen on hard times. The crumbling, brutalist-style building is often described as a prison, and graduation rates hover around 60 percent.
But it wasn't always that way. Once upon a time, the yearbook read like a Who's Who of black America.
Police in Washington, D.C., say a woman has been arrested, suspected of splattering green paint across the organ at the National Cathedral, the Episcopalian church that has long served as the country's spiritual home.
President Obama and former Secretary of State Hillary Clinton met Monday for a private lunch that immediately sparked speculation about what it means for the 2016 presidential race.
The visit marked at least the second time the two have met privately since Clinton left the State Department earlier this year. Clinton and her husband, former President Bill Clinton, met with Obama and first lady Michelle Obama for a private White House dinner in March.
For decades, Koreans have been pushing to preserve the legacy of women forced to provide sex to Japanese army soldiers during World War II. Glendale, Calif., will dedicate a statue memorializing the victims, known as "comfort women," on Tuesday. But the statue has spurred controversy in this Southern California city, where some area residents say it is a divisive reminder of the horrors of war.
The sculpture is a bronze statue of a young girl. She looks about 14 — around the same age as many comfort women when they were forced into military brothels run by Japan's imperial army.
At Margaret O'Keefe's farm in East Texas, they grow high-quality Bermuda grass. The fields are flat and vibrant green, surrounded by woods of a darker, richer green. The family loves this land. O'Keefe inherited it from her mother, who divided it among eight children.
"She used to call it 'enchanted valley,' " O'Keefe says.
But her "enchanted valley" also lies in the path of the Crosstex NGL Pipeline.