This video takes a look at hydrothermal vents and the novel life forms that thrive there in the absence of sunlight, fueled by underwater volcanoes. One of these harsh environments is the Axial Seamount off the West Coast of the United States.

Greentraveller's Richard Hammond shows you some of the loveliest and greenest spots in London, and gives some tips for navigating through the city.

When you listen to music, multiple areas of your brain become engaged and active. But when you actually play an instrument, that activity becomes more like a full-body brain workout. What's going on? Anita Collins explains the fireworks that go off in musicians' brains when they play, and examines some of the long-term positive effects of this mental workout.

Singer Meghan Trainor sits down with Ellen for her first interview since undergoing vocal cord surgery.

Jamila Lyiscott is a “tri-tongued orator;” in her powerful spoken-word essay “Broken English,” she celebrates — and challenges — the three distinct flavors of English she speaks with her friends, in the classroom and with her parents. As she explores the complicated history and present-day identity that each language represents, she unpacks what it means to be “articulate.”

The solar airplane Solar Impulse 2 was presented on April 9th, 2014. The construction of the experimental solar aircraft didn't happen in a day. Watch this video about the construction of Solar Impulse 2 and understand the steps that had to be taken to attempt the first solar flight around the world!

President Obama drops by a meeting with YouTube personalities to learn about how they're using YouTube to connect with an audience of millions of people and to discuss why it's important for young people to visit HealthCare.gov and learn more.

A film about the global sustainability work of The Prince's Charities, founded by HRH The Prince of Wales.

In the war zones of Liberia and Congo, four volunteers with Médecins Sans Frontières (MSF) struggle to provide emergency medical care under extreme conditions. With different levels of experience, each volunteer must find their own way to face the challenges, the tough choices, and the limits of their idealism.

What does the Holocaust have to do with us, anyway? In part four, Roderick Miller, the chair of the nonprofit organization Tracing the Past, gives a talk at TEDxVienna about the Holocaust and contemporary Europeans' perception of the space they live in.

Late, great actor DeForest Kelley talks about the success of the "Star Trek" series and what it's like to be an aging actor at the time of the release of "Star Trek V: The Final Frontier". This includes a great clip from the original series featuring William Shatner, Leonard Nimoy and actress Joan Collins. Enjoy!

What does the Holocaust have to do with us, anyway? In part one, Roderick Miller, the chair of the nonprofit organization Tracing the Past, gives a talk at TEDxVienna about the Holocaust and contemporary Europeans' perception of the space they live in.

Bruce Willis talks with Hollywood reporter Jimmy Carter about his own favorite films and his aversion to administering corporeal punishment to children. When Carter inadvertently insults Willis by saying that the film "Deep Impact" is "bigger than two Die Hards", watch how Willis proves himself a master of diplomacy. Who could have guessed?

All Hands Volunteers is a US-based, non-profit organization that provides hands-on assistance to survivors of natural disasters around the world with maximum impact and minimum bureaucracy. Their mission is to enable volunteers to provide assistance to communities affected by natural disasters.

Planning on flying during the Christmas season? Then watch this useful clip from Delta Airlines. It contains in-flight passenger safety instructions... with a touch of holiday cheer!