And when the use of intrauterine devices and hormonal implants by young women goes up, the number of unplanned pregnancies sharply drops, researchers find.
It's crunch time for the U.S. Supreme Court, as consequential decisions will be coming soon. The biggest issues left: same-sex marriages, subsidies under Obamacare and lethal injection drugs.
Americans' relationship with sports changes as we grow older. About three-quarters of adults say they played sports as children. By the time people are in their late 20s, only about a quarter do.
Research shows that, even with health insurance, many people put off expensive surgery, medicine and tests because they can't afford the high deductibles or copays. A few states hope to change that.
If you've got a life-threatening medical condition, your first call might not be to an economist. But Alvin Roth used a theory about matching markets to help connect kidney patients and donors.
Most people buying Obamacare plans next year are likely to face a small increase in the price of monthly premiums, early numbers suggest. A few plans are asking for steep price hikes, but that's rare.
President Obama hails the Affordable Care Act for driving the uninsured rate "to its lowest level ever." But changes in how the rate has been measured make historical claims difficult.
A Supreme Court ruling could threaten health insurance subsidies in about three dozen states. But many states aren't sharing contingency plans lest they be seen as supporting Obamacare.
More than 6 million people could lose income-related subsidies if the Supreme Court strikes them down for coverage bought through the federal exchange, HealthCare.gov.