CARL AZUZ, CNN ANCHOR: Whether it`s your first day of school or you`ve been with us the past few weeks. Thank you for watching CNN STUDENT NEWS. We are your cost-free and commercial free source for current events. I`m Carl Azuz. PLAY

First up, unexpected interviews with three Americans detained in North Korea. This is a secretive communist country. It`s been at odds with South Korea and the United States since fighting stopped in the Korean War in 1953. A CNN reporter was on a government tour of North Korea when he was taken to a secret location to interview each of the Americans. That included Kenneth Bae, a 46-year old Christian missionary. North Korea imprisoned him for what it called hostile acts to bring down its government. PLAY

KENNETH BAE, AMERICAN HELD IN NORTH KOREA: I`ve been asking the American government to act upon getting me released here and I do believe that special envoy need to come in order to resolve the situation that I`m in right now. PLAY

AZUZ: All of the detainees say they`ve admitted guilt to North Korea, though one doesn`t know what he`s being charged with. CNN couldn`t tell what kinds of conditions they were being held in, North Korean government officials monitor the interviews and carefully guided CNN`s tour of North Korea. PLAY

WILL RIPLEY, CNN CORRESPONDENT: The moment we land in North Korea it feels like we are walking into a time ward, a nation decades behind the developed world, trying to catch up and trying even harder to control the flow of information. PLAY

From the round we take to the pictures we take, government minders are watching our every move. They control what we see and what we don`t see. Our first stop, the birthplace of the nation`s founder, a man they call their eternal president Kim Il-sung. PLAY

Every North Korean who comes to Pyongyang will visit Mangyongdae at least once. This is considered a sacred place, and coming here is a pilgrimage. These students travel 23 hours to drink from the Kim family`s well. PLAY

"I want to come back again," says 12-year old Ko Chen Yang (ph). He comes from a rural area in the far north, a far cry from the capital, the showpiece of the nation. PLAY

This is the most modern children`s hospital in the entire country. It took about a year to build, opened up six months ago, and it`s not just a medical equipment that`s state of the art. We are told kids actually pretend to be sick just so that they can use the playground. PLAY

There are 300 beds in this hospital, in a city of more than 2.5 million people. It`s one of several pet projects of the nation`s young leader Kim Jong-un who inherited power from his father and grandfather before him. PLAY

Another price project, the massive Munsu Water Park finished in just nine months. PLAY

We are told Kim Jong-un meticulously scrutinized every detail of this water park. He examined the plans personally, we're told 113 times and even had his high ranking government officials test out those water slides to make sure they were safe. PLAY

As these people play, the United Nations worries others are suffering. The World Food Program says many North Koreans face regular food shortages. PLAY

You wouldn`t know it with all the money spent on projects like this. Here, no expense is spared to put a modern, happy face on Pyongyang. The rest of North Korean is kept hidden from our cameras and the eyes of the outside world. Will Ripley, CNN, Pyongyang, North Korea. PLAY

DAVID CAMERON, BRITISH PRIME MINISTER: We must use all the resources at our disposal, our aid, our diplomacy, our military. We need a firm security response where the military action to go after terrorists, international corporation on intelligence, or uncompromising action against terrorists at home. Britain`s already providing equipment directly to Kurdish forces. We support U.S. military airstrikes against ISIL in Iraq. PLAY

AZUZ: We started in North Korea, we are picking up in Britain. You just heard its leader speak about ISIL or what we call ISIS. That stands for Islamic State in Iraq and Syria. And what separates ISIS from other terrorists groups is that it`s not looking for a country to be its base. ISIS wants to create its own country based on its own extreme interpretation of Islam. It`s been murdering scores of people in Iraq and Syria who don`t share its beliefs. On Friday, Britain`s raised its terror threat level to severe. That means it believes that terrorist attack on British soil is likely, though it`s not necessarily imminent. PLAY

U.K. officials estimate that 500 British citizens have gone to fight for ISIS or other terrorist groups. The prime minister wants to keep those people from returning and to give police the ability to seize the passports of anyone suspected of traveling to support terrorism. PLAY

Well, it`s called Labor Day, but relatively little labor gets done on the first Monday in September. You know, Labor Day is a holiday to honor American workers. Here are five things you might not have known. PLAY

One, the first Labor Day Parade was on Tuesday, September 5, 1882. New York City saw 10,000 workers participate. Two, Oregon was the first state to make Labor Day a legal holiday. That was in 1887. Three, U.S. government under President Grover Cleveland made it a national holiday in 1894. Four, Labor Day has lots of unofficial significance. The unofficial end of summer, the unofficial end of when you should wear white shoes, the unofficial beginning of national political campaigns. And five, there`s a similar holiday in other countries. It`s called May Day, and it`s on May 1. PLAY

"Roll Call." There`s only one place we look for your request: our transcript page at cnnstudentnews.com. These three schools posted on last Friday`s transcript. Ledyard High School in Ledyard, Connecticut. The colonels are in command from the northeast. Whitehall High School in Whitehall, Montana. Great to have the Trojans with us today. And Trevor G. Browne High School in Phoenix, Arizona. Can you bear the Bruins? They round up today`s roll call. PLAY

Your science teachers have taught you about non-renewable resources: coal, mineral, natural gas. And renewable ones: oxygen, wood, wind. The last one could be an effective source of renewable energy. Giant wind turbines can cost more than $1 million each to install. Considerably more to move them out into the ocean. That solves some people`s criticism that the noise - or unpleasant to look at. It doesn`t solve the problem involving wildlife. PLAY

UNDIENTIFIED FEMALE: This is the London Array - it` the world`s largest offshore wind farm. And this is what it helps power. The farm has 175 giant wind turbines, capable of generating enough electricity to power half a million homes. And it`s quite possibly the answer to London`s growing energy needs. PLAY

MIKE O`HARE, LEAD MANAGER OF THE ARRAY: We expect about 900,000 tons of carbon dioxide to be saved each year that would have otherwise been put into atmosphere. That`s about the equivalent of just under 300,000 cars a year taking off the road. PLAY

RACHEL CRANE, CNN CORRESPONDENT: Approximately 8.3 million people live here, and by 2031 that number is expected to climb to 10 million. A growing population means a growing need for energy. PLAY

London, one of the most historic cities in the world, knows that in order to keep up with future energy demands, they need to update and diversify their energy portfolio. PLAY

UNIDENTIFIED MALE: Straight about how do we get to, you know cleaner future, reliable energy source, and that`s for England that I`m going to raise about, is moving from that, you know, coal, gas, nuclear to more, you know, renewable in offshore winds. The U.K. is one of the world`s leaders in offshore wind power. There are over 1,000 turbines dotting the waters. PLAY

These things are massive, each turbine is larger than the London eye, and it takes as little as a 10 mile an hour gust to spin this. PLAY

Until recently, the Array was set to expand by possibly 57 more turbines, but construction was halted to save a rear breed of bird called the red-throated diver. PLAY

UNIDENTIFIED MALE: There's a rare species of bird in the U.K. and they (inaudible) during the winter. And they feed there. PLAY

CRANE: The fear is that the construction on the second phase would displace the birds. PLAY

(on camera): Is it a bit of a disappointment that it`s not in the near future for you? PLAY

UNIDENTIFIED MALE: I think as an engineer, I always wanted to build things so of course, I would like things to go ahead, but you know having said that, you`ve got to be realistic. I work with offshore wind cause I care about the environment. PLAY

CRANE: The future will present more obstacles than a bird, but one thing is certain: more of this means more of this. PLAY

AZUZ: If the northern lights are called Aurora Borealis, and the southern ones are called Aurora Australis. What do you call them in space? Just depends on what you are looking at. These are still the northern lights. This video was taken from aboard the international space station. If it looks like they are flying by fast, it`s because the station orbits Earth every 90 minutes. And it looks like they are having a roaring good time. PLAY

We always make a little space for puns at the end of the show. Some are out of this world, some are kind of spacey, but they are all part of Aurora. I`m Carl Azuz, for CNN STUDENT NEWS. PLAY