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Varying speed while walking may make the activity much more effective.

Interval Training While Walking Helps Control Blood Sugar

Lots of high-performance athletes use interval training to maximize their fitness.

From runners to cyclists to boot-camp fanatics the strategy involves alternating between periods of high-intensity and lower-intensity aerobic training.

Now, a study published in the journal Diabetologia finds that interval training may help the millions of people with Type 2 diabetes and prediabetes who are trying to control their blood sugar.

Iraqi Christians who fled the violence in the village of Qaraqush rest upon their arrival at the Saint-Joseph church in the Kurdish city of Arbil.

As ISIS Advances In Iraq's North, U.S. Weighs Airstrikes, Humanitarian Aid

The Sunni militant group known as the Islamic State continued its aggressive assault on Iraq on Thursday.

This time, the militants made gains in Iraqi Kurdistan, an autonomous region in the north of the country. After a week of conflicting reports, The New York Times and The Associated Press are reporting that fighters with the group also known as ISIS have, indeed, captured Iraq's largest dam.

Tampose Mapotheng, age 28, has felt isolated and ostracized since coming out as a transsexual man four years ago.

Young, Idealistic And Transsexual: Speaking Out In Africa

Tampose Mapotheng has a cold. His lymph nodes are swollen, and it's a bit uncomfortable for him to talk in the air-conditioned hotel in Washington, D.C., where he is attending a conference. But when I ask him to tell me about himself, Mapotheng's voice grows strong, with a composure that belies his 28 years.

"I'm from Lesotho," Mapotheng says assuredly. "I'm a human rights defender. I'm a transsexual man."

Jay Ashcroft, who's running for a Missouri state Senate seat, works at the Ashcroft Group, a legal and consulting company run by his father.

Familiar Name Returns To Missouri Ballot

Jay Ashcroft isn't exactly a stranger to the political process. After all, his father ran for — and, numerous times, won — congressional and statewide offices during his lengthy tenure in Missouri politics.

But the son of former U.S. Attorney General John Ashcroft admitted he was a bit nervous waiting to see if he emerged victorious in a three-way GOP primary for a St. Louis County-based state Senate seat. He said his "stomach was in knots" until he found out he had won.

"It was really humbling," said Ashcroft in a telephone interview.

By selecting for a slightly different shape in the scales of the wing, scientists bred a population of brown butterflies into blueness.

Butterfly Shifts From Shabby To Chic With A Tweak Of The Scales

Explore the soft, smooth-looking surface of a butterfly wing through an electron microscope and you'll see it's actually covered in rugged, textured scales that overlap like shingles on a roof.

Zoom in even more, to the nano scale, and you'll find a labyrinth of hard, transparent architecture — pillars, ridges, archways, and sometimes even spiral loop-the-loops, all made of chitin, the same material that makes crab shells so tough.

U.S. Maj. Gen. Harold Greene was visiting an Afghan military training academy Tuesday when he was shot dead by an Afghan soldier, who was subsequently killed. Afghan troops who knew the attacker say he disliked the Taliban and they aren't sure what his motive was.

The Murky Motives Of The Afghan Soldier Who Shot A U.S. General

The Afghan soldier who fatally shot a U.S. major general on Tuesday had no sympathy for the Taliban, and his motives for the shooting are far from clear, according to his fellow soldiers.

Afghan officials have identified the attacker as Rafiqullah, who, like many Afghans, goes by one name. He opened fire on a delegation of NATO officials who were visiting the Marshal Fahim Military Academy outside Kabul. He killed Maj. Gen. Harold Greene and wounded 15 other NATO service members who were visiting the compound. Four Afghans were also wounded.

House Calls Keep People Out Of Nursing Homes And Save Money

When it comes to reining in medical costs, delivering more health care and bringing it right to the patient's home can, for a select group of patients, save money.

These particular patients are elders struggling with multiple chronic medical conditions, such as congestive heart failure, stroke, diabetes or dementia. They make up just 5 percent of the people on Medicare, but they account for about half of all Medicare spending.

Soum Rithy (center left), who lost family members during the Khmer Rouge regime, and Chum Mey, a survivor of the notorious Tuol Sleng prison, embrace after the verdicts were announced Thursday in Phnom Penh, Cambodia.

Senior Khmer Rouge Leaders Found Guilty Of Crimes Against Humanity

Two senior Khmer Rouge leaders were found guilty of crimes against humanity in Cambodia on Thursday.

As The New York Times explains, the verdict, handed down by a joint Cambodian and United Nations tribunal, is the first against top leaders of the genocidal Khmer Rouge regime.

The forecast path of Hurricane Iselle.

Hurricane Iselle: Hawaii Forecast To Take First Direct Hit In 22 Years

At the moment, Hawaii is forecast to receive a direct hit from a hurricane for the first time in 22 years.

As we reported, Hurricane Iselle was expected to weaken into a tropical storm before it raked the Big Island, but hasn't happened. The system still had maximum sustained winds of 90 mph as of Thursday morning.

<a href="" target="_blank">Game-based learning teaches students to solve problems in context</a>.

Tests That Look Like Video Games

This week, NPR Ed is focusing on questions about why people play and how play relates to learning.

Imagine you're playing a computer game that asks you to design a poster for the school fair. You're fiddling with fonts, changing background colors and deciding what activity to feature: Will a basketball toss appeal to more people than a pie bake-off?