Life on the International Space Station may never be the same. The crew is now unpacking the latest cargo delivery, which includes the station's first-ever 3D printer.
"Having that on-demand capability is a real game-changer," says Niki Werkheiser, NASA's 3D Printing in Zero-G project manager.
Astronauts will test how the printer performs in microgravity. Samples will be brought back to Earth, to confirm that the technology works the same as on the ground.
If it's successful, the ISS crew will no longer have to rely on resupply missions to bring them the tools they need.
And down the line, a 3D printer would also be a key part of deep space exploration missions.
"We won't be able to launch every single thing that we might ever need with us," Werkheiser says. "So we'll have to have sustainable technologies that allow the astronauts to be able to adapt and use whatever resources are available to them for living and operations."
To many people, it's the defining image of the Tiananmen crackdown: a single man staring down a line of tanks.
"Tank Man" photographer Jeff Widener recalls what it took to capture that moment.
"I had to get a bicycle and go all the way down past soldiers and tanks and sporadic gunfire in the distance," Widener says. "And then you had to get past secret police, who were using electric cattle prods on the journalists if they didn't give up their supplies."
Of course, getting the photo out to the world was also extremely difficult. Click here to find out how he did it.
Widener also remembers the sense of hope among those student protesters in 1989.
"What struck me as something very dramatic was the building of the Goddess of Democracy," he says. "Because there you have the symbol of freedom, which is basically a duplication of the Statue of Liberty. And that is facing right across the street from the Mao portrait at the Forbidden City."
But, Widener adds, that he and other journalists wondered how long it would be until the Chinese government refused to tolerate the face-off any more.
Cristina Gonzales Romualdez says she didn't expect that much water.
She's a city councillor in Tacloban, which took a direct hit from Typhoon Haiyan. She's also the wife of mayor Alfred Romualdez.
But more importantly, on the day of storm, she's a mother of two.
Gonzales Romualdez says she and her daughters swam to safety. She told Kristie Lu Stout that she prayed the entire time, and fought to keep calm for her children.
Watch the video for her dramatic account how it all happened.
Say what you will about the science. The movie "Gravity" makes you feel like you're in space.
Of course, only a few people know that feeling firsthand. NASA astronaut Michael Massimino is one of them.
Massimino flew on two Hubble Space Telescope servicing missions. And he has logged more than 30 hours across four space walks.
That's exactly what the movie's main characters are doing when everything goes wrong.
So, what's it really like to spacewalk?
"You have to be methodical about what you do. You don't want to move too quickly," Massimino says. "You have to be very, very slow. You have to think about what you're doing. Work with your teammates, both outside the spaceship, inside the spaceship and the people on the ground."
Massimino admits it can be scary. But he adds, "I can't think of anything better to do for a living than go out and spacewalk and work out there in the beauty of space."
Find out what Massimino thinks of the movie, and George Clooney in particular, in the full interview above.
Yahoo was already around two years old by the time app developer Nick D'Aloisio was born. Now the Internet giant is paying the teen millions of dollars to acquire his mobile start-up, Summly.
Neither side has released details of the deal. But we do know the 17-year-old will go to work for Yahoo... while still doing homework.
D'Aloisio tells News Stream, "I’ll be focusing on other projects on the side as well as finishing my A-level exams. But I’m really going to be focusing on integrating summarization technology at the heart of Yahoo’s mobile solution. These summaries that we provide make it a lot easier for users to consume content and information when they’re on their mobile screen. So it’s really exciting to be working with Yahoo and Marissa Mayer on this."
But this deal is notable for much more than D'Aloisio's age. It tells us that Yahoo's Marissa Mayer is interested in making Yahoo relevant for the mobile space.
A string of CEOs before her have tried and failed to figure out what Yahoo does. Mayer has made many internal changes since taking the helm. But her broader vision for the company still remains to be seen.
You can officially call him "Mister President" now.
Xi Jinping has taken the title from Hu Jintao, completing the country's leadership transition. It comes four months after Xi became General Secretary of the Communist Party.
Political commentator and columnist Frank Ching says, "I think Xi Jinping knows that the main problems of China are domestic. When he first became the party leader back in November, he came out and met the international press. He gave a speech and said not a word about foreign policy. It was all domestic. So I think that's where the emphasis is going to be."
The question is where to start.
The United Nations says more than one million Syrians are now refugees. That means nearly one out of every 22 citizens have fled for safety.
The news come as the country approaches the second anniversary of its civil war.
The U.N.'s refugee agency tweeted this picture after announcing the alarming new number. It says, "Meet Bushra, the millionth registered refugee from Syria."
The sign in her hands says, "One in a million." It's a reminder of the many, many others who share her desperate situation.
She also holds a small child. The U.N. says around half of the refugees are children. Most are under the age of eleven. It's hard to imagine the things they have seen and experienced in their young lives.
As Syria's deadly conflict grinds on, more and more people are making the difficult decision to seek shelter in another country. The UNHCR notes, "They arrive traumatized, without possessions and having lost members of their families."
The U.N. estimated there would be 1.1 million refugees by the end of June. But more than 400,000 Syrians have fled their homes since the start of 2013. And it's only March.
Sinkholes happen fairly often in Florida. But rarely do they occur with such drama.
A 36-year-old man is presumed dead after a sinkhole suddenly opened beneath his bedroom Thursday night. The victim's brother says the crash of the collapse sounded like a car driving through the house.
The sinkhole in suburban Tampa was originally reported to be 100 feet (30 meters) across. An engineer says that is actually the diameter of the safety zone, while the sinkhole is about 20 to 30 feet across.
Sinkholes can suddenly happen when bedrock dissolves but the surface stays intact. The void eventually collapses.
Authorities in Florida currently believe this one happened naturally, meaning the rock was probably eroded away by groundwater. Sometimes manmade situations, such as water main breaks, can be responsible.
Most top tech brand showcase their latest products at the Mobile World Congress in Barcelona, Spain. Of course, one big name is missing. Apple never attends shows like this.
And it feels like other companies are starting to follow suit.
The Verge's David Pierce says it feels like Samsung is starting to pull away. He notes that the Galaxy S4 will come out in two weeks in New York, though it did announce the Galaxy Note 8 in Barcelona. HTC unveiled its flagship phone last week. Google executives are in attendance, but the company does not have booth and announced its new Chromebook last week. And Pierce feels Nokia fell flat, failing to announce anything big.
So is the Mobile World Congress going the way of Las Vegas's Consumer Electronics Show?
Pierce says, ""There's a lot here but it seems like a show like this, and even CES, they're becoming traditional trade shows again where it's industry people coming to getting to know each other and make deals. There's a putting green upstairs just for making deals. It seems like, in a sense of big consumer show where we see the really exciting stuff, it's starting to slow or at least lull."
And there are many movers-and-shakers at MWC. Check out our Day 3 highlights below:
Foursquare CEO Dennis Crowley
PayPal President David Marcus
BlackBerry's Vivek Bhardwaj, the man behind BB10 OS
Plus, a fun look at how FC Barcelona reaches its fans through apps!
As you might imagine, mobile phones are front and center at the Mobile World Congress in Barcelona, Spain. We've already highlighted Nokia's big push with cheaper phones.
Nokia CEO Stephen Elop also hinted the company is looking to launch a tablet. He told Kristie Lu Stout, "We're considering what's the right way to enter, if we were to enter. How do we differentiate in that market. How do we as confidently stand up with a tablet as we do with the Lumia smartphones. We want to make sure we understand all of that."
Three of the biggest new products at the show this year are tablets. They are the latest offerings from Hewlett-Packard, Samsung and Sony.
HP is back in the tablet market with the 7-inch Slate 7. But CNNMoney's Adrian Covert says, "(It) is not a premium-grade tablet, nor a remarkably cheap device."
Samsung's Galaxy Note 8 takes aim at Apple's iPad Mini. Covert calls the Galaxy Note 8 "fast and speedy." But he notes that while 8 inches is small for a tablet, it's huge for a phone. It is still unclear if the phone-enabled version will be sold in the U.S.
Covert says Sony's Xperia Tablet Z could be the best tablet at the Mobile World Congress. And at 10.1 inches, it is also one of the biggest.
Among our other Day 2 highlights:
Discussing the rise of Chinese smartphones
Nvidia's Project SHIELD and its new vision for gaming on the go
Sitting down with Greg Sullivan, Microsoft's Senior Marketing Manager
Catch News Stream with Kristie Lu Stout weekdays at 8pm HKT/ 12pm GMT / 8am ET on CNN International.