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For her trigonometry class, Sarah Hagan (center) uses everything but the kitchen sink: a flower pot, garbage basket, rolls of tape, rubber balls, even loose spaghetti.

The Teacher Who Believes Math Equals Love

What makes a great teacher great? That's the question at the heart of 50 Great Teachers, from the NPR Ed Team.

Sarah Hagan has a passion for math, and the pi-shaped pendant to prove it.

The 25-year-old teaches at Drumright High School in Drumright, Okla. The faded oil town is easy to miss. Fewer than 3,000 people live there, and the highway humps right around it.

A woman wears a face mask on a hazy January day in downtown Shanghai. China has ordered a popular anti-pollution film removed from major online outlets. In Xi'an, two people who had protested against smog were reportedly detained.

Anti-Smog Film Is Pulled In China; Protesters Reportedly Detained

A human rights group says that police in China detained two people Monday for protesting the government's approach to air pollution. One of the protesters was detained for slander, according to China Human Rights Defenders.

The group says the pair were released after being held overnight, with an update published Monday citing "the pressure of public opinion at home and abroad."

Boston Marathon bombing survivor Karen Brassard, left, and bombing witness Carlos Arredondo, right, leave a federal courthouse last week during the trial of accused bomber Dzhokhar Tsarnaev in Boston.

Boston Marathon Bombing Trial Enters 2nd Week

More survivors of the Boston Marathon bombing are expected to tell their stories Monday morning in the trial of Dzhokhar Tsarnaev. Those testifying already have included a father whose 8-year-old son died in the attack.

Tsarnaev's defense team insists he was pressured by his older brother, Tamerlan, into wreaking violence that killed three people and injured more than 260. He was 19 at the time of the 2013 attacks.

Apple CEO Tim Cook speaks Sept. 9 during an event at the Flint Center for the Performing Arts in Cupertino, Calif., where he unveiled the Apple Watch. The device officially goes on sale Monday.

As Apple Watch Launches, Taking Stock Of Competitors And Possibilities

Like an elephant splashing down in a mud hole, Apple's entry into the smart watch market is expected to have a huge impact. How much of one is a multibillion dollar question.

You don't see too many people wearing smart watches walking down the street, even in San Francisco. Even at the Game Developers Conference there last week, techies in attendance sported plenty of wearable tech, but few smart watches.

Syrian volunteers cover mosaics in the Ma'arra Museum with a protective layer of glue, covered by cloth.

In Syria, Archaeologists Risk Their Lives To Protect Ancient Heritage

The race to protect Syria's heritage from the ravages of war and plunder has brought a new kind of warrior to the front lines.

These cultural rebels are armed with cameras and sandbags. They work in secret, sometimes in disguise, to outwit smugglers. They risk their lives to take on enemies that include the Syrian regime, Islamist militants and professional smugglers who loot for pay, sometimes using bulldozers.

Former Florida Gov. Jeb Bush speaks to members of the media during a two-day swing through Iowa that had all the trademarks of a presidential campaign.

In Iowa, 2016 Has Begun — At Least For The Republican Party

After five days spent driving around Iowa, meeting with political activists, consultants and regular voters, one thing is clear: the 2016 presidential campaign is on — at least on one side.

Nine GOP Men, One Stage, Six Hours

Since Google Fiber rolled out gigabit broadband in Kansas City four years ago, residents have enjoyed fast Internet connections, including at what locals call "the world's fastest Starbucks."

In Kansas City, Superfast Internet And A Digital Divide

Kansas City has some of the Internet best service anywhere. Providers there jostle for customers who can now expect broadband that's about 100 times faster than the national average.

But, four years after Google Fiber landed in Kansas City, people are still trying to figure just what do with all that speed.

Kansas City's a modest, Midwestern place. Residents are proud of their barbecue and baseball team. But Aaron Deacon says that now there's something else: inexpensive, world-class Internet.

Kristen Caminiti cuddles her son Connor while doctors stitch her up following a C-section.

The Gentle Cesarean: More Like A Birth Than An Operation

There are many reasons women need cesareans. Sometimes the situation is truly life threatening. But often the problem is labor simply isn't progressing. That was the case for Valerie Echo Duckett, 35, who lives in Columbus, Ohio. After receiving an epidural for pain, Duckett's contractions stopped. By late evening she was told she'd need a C-section to deliver her son, Avery. Duckett says she has vague memories of being wheeled into the OR, strapped down and shaking from cold.

The British rock band Deep Purple, shown here in 1971, wrote the hit song "Smoke on the Water," after watching the casino in Montreux, Switzerland, go up in flames later that year. The casino caught fire during a Frank Zappa concert.

A Swiss Town, A Casino Fire And 'Smoke On The Water'

The lakeside Swiss town of Montreux was in the news this week as the host of nuclear talks between Iran and six world powers.

But for rockers of a certain age, Montreux will always be best known for its rich musical history — including the roaring casino fire that inspired the English rock band Deep Purple's classic "Smoke on the Water."

Carly Medosch has conditions that cause intense fatigue and chronic pain. She took part in a 2014 Stanford Medicine X conference that included discussion of "invisible" illnesses.

People With 'Invisible Disabilities' Fight For Understanding

Some disabilities are more obvious than others. Many are immediately apparent, especially if someone relies on a wheelchair or cane. But others — known as "invisible" disabilities — are not. People who live with them face particular challenges in the workplace and in their communities.

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