Sigrid talks about some of the ways she learned how to speak Italian and French.

We all know that whales are endangered due to hunting and pollution, but do you know how important they are for the ocean and the environment? This video shows how essential a healthy population of whales is to the ocean ecosystem. Creative Commons Attribution license (reuse allowed). Video was not modified. Please visit sustainablehuman.org for credits and more information.

This performance of "Wonderful Tonight," one of Eric Clapton's later hits, features dynamic solos by Clapton and singer Katie Kissoon. Enjoy!

Learn about the states of matter, solids, liquids and gases, how they're different and where they're found in everyday life.

Taylor Swift's song "Wildest Dreams" was the fifth chart-topper from her album 1989. The music video, directed by Joseph Kahn, references classic Hollywood romances.

Over the course of human history, thousands of languages have developed from what was once a much smaller number. How did we end up with so many? And how do we keep track of them all? Alex Gendler explains how linguists group languages into language families, demonstrating how these linguistic trees give us crucial insights into the past.

Jimmy Fallon can't believe he's at the White House on the Fourth of July. Watch part of his stand-up performance from that evening in which he does impressions of ten other comedians!

U2 singer Bono's vocal talent is showcased in this breathtaking performance of "Every Breaking Wave" at the MTV Europe Music Awards 2014.

Is there a difference between college and university in the United States? What about high school? All that and more is explained in this video!

Texas rock band Z.Z. Top have been together for over forty years and are still known for their song "Gimme all your lovin'" off the album "Eliminator."

"See You Again" is a song recorded by the American rapper Wiz Khalifa featuring Charlie Puth. The track is part of the soundtrack of the action film Furious 7 and was created in memory of the "The Fast and the Furious" actor Paul Walker, who died in a car accident.

The great white shark and killer whale are both infamous marine predators. Normally they leave each other alone, but one day, biologists off the cost of California witness something unprecedented.

Here is American hard rock band Van Halen performing their most successful single to date, "Jump" from their album 1984.

This children's song reviews family members and basic verbs. Who is in your family?

In this week's Lightning Round, Neil Patrick Harris and Billy Eichner take to the streets to find out how New Yorkers feel about the end of the series How I Met Your Mother.