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?"
A year ago, Montana opened the nation's first clinic for free primary healthcare services to its state government employees. The Helena, Mont., clinic was pitched as a way to improve overall employee health, but the idea has faced its fair share of political opposition.
A year later, the state says the clinic is already saving money.
Pamela Weitz, a 61-year-old state library technician, was skeptical about the place at first.