Melissa Block

This week, the Olympic champion runner Caster Semenya of South Africa filed an appeal in a case that hinges on her right to compete as a woman. It's the latest chapter in a fight that's gone on for years, and that raises thorny questions about fairness and ethics in sport.

Arivaca, Ariz., is a tiny village, population about 700, with an outsize problem.

It sits just 11 miles from the U.S.-Mexico border and has become a magnet for self-styled militia groups from out of state that say they want to patrol the border and stop migrants. Their presence has strained a town that has long prided itself on its live-and-let-live, cooperative spirit.

When the women of Arivaca gather for Monday afternoon gentle yoga, there are certain topics they know to avoid.

Carmen Schentrup was one week away from celebrating her 17th birthday when she was killed in last year's mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla.

A talented musician and driven student, Carmen had dreams of becoming a medical researcher and finding a cure for the neurodegenerative disease ALS.

Now, her parents, Philip and April, wear teal bracelets printed with her name and the dates that mark her short life: 2/21/2001-2/14/2018.

Doctors across the U.S. have become increasingly vocal in addressing gun violence as a public health crisis, a posture that recently has drawn the wrath of the National Rifle Association.

Yet, in Colorado, a diverse group that includes doctors, public health researchers and gun shop owners has come together to bridge this divide. The Colorado Firearm Safety Coalition has found common ground on at least one issue: preventing firearm suicide.

Families of people with dementia will often take away the car keys to keep their family member safe. They might remove knobs from stove burners or lock up medicine.

But what's less talked about is the risk of guns in the home for those with dementia.

Immigration is near the top of the list of issues Americans find "the most worrying," according to a new poll conducted for NPR by the research firm Ipsos.

But Americans' views on immigration diverge sharply depending on party affiliation, where in the country we live, and whether we know people who were born outside the United States.

In the Winter Olympics, where races can be won or lost by thousandths of a second, tiny imperfections can make all the difference.

Nowhere is this more true than in the ice venues, where skilled technicians called "ice meisters" have honed their expertise over years of crafting the perfect surface.

Make that surfaces: It turns out that all ice is not created equal.

Depending on the sport, the ice might need to be softer or harder, colder or warmer, textured or smooth.

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ARI SHAPIRO, HOST:

There are Olympic athletes, and then there are Olympic families. NPR's Melissa Block caught up with a famous former Olympian as she watched her daughter compete in South Korea.

UNIDENTIFIED CROWD: (Singing) We will, we will rock you.

Since she was a little girl, Ashley Caldwell has been in constant motion: jumping out of her crib, tumbling off the couch, leaping down stairs, flipping on a trampoline.

So it seems fitting that now, at 24, Caldwell is the reigning women's world champion in aerials skiing — a sport in which she somersaults and spins through the air, some 60 feet off the ground.

Remember this name: Maame Biney.

The short track speedskater just turned 18; she's not even out of high school. But she is already one of the biggest U.S. names at the Winter Olympics.

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