Why do some of the national parks in the United States resemble the European Alps? Geologist Dr. Robert Darga answers this question.

Prince said this about his song: "...Stay happy, stay focused, and you can beat the de-elevator [the "down" elevator as a metaphor for Satan]." It may be hard to understand the lyrics in this performance, but they're worth checking out. Find extended lyrics here

Natalie provides some tips for wasting less plastic and leaves us with a slogan to help us rethink our flushing habits. She involves the audience to bring the message home.

This song from the album “A Night at the Opera” is considered one of the greatest rocks songs of all time. Music industry producers thought it was too long, at just under six minutes in length, and that no one would listen to it. Instead, it is the most streamed piece of music from the 20th century.

Meet Sheldon, he’s been driving pizzas longer than anyone at Bob’s Pizza. He seems to be a little too comfortable in his role of senior pizza driver!

Here's the trailer for an inspiring film about the efforts of ordinary people to make the world a more sustainable place. Experts talk about the necessity of taking action.

Go behind the scenes of Entertainment Weekly's cover shoot with Dwayne Johnson as he gets into the holiday spirit! He has fun playing “Dwanta Claus,” lists his favorite holiday movie and song, and talks about his appreciation of the gifts he receives from fans.

Ellen and Channing talk a bit about Magic Mike, a show in Vegas, and go on to talk about the animated movie Smallfoot, where he does the voice of Migo.

Topsy and Tim give us a countdown of their favorite things about Christmas. The twins are featured on the BBC's CBeebies, a TV channel for pre-schoolers.

In this famous live performance, David Bowie and Tina Turner perform a duo version of "Tonight," a song originally written by Iggy Pop and Bowie. The lyrics are simple and repetitive, but when the two stars get together onstage, there's magic.

An animated video of the festive British carol, “We Wish You a Merry Christmas.” The carol's origins are not known, but it was first written down in 1935 by Arthur Sydney Warrell, a Bristol choirmaster.

Katie Melua covers one of Joni Mitchell's most famous songs. Although the song is merely set near Christmas time, rather than being about Christmas, it has become something of a modern Christmas standard.

Channing Tatum makes one incredible entrance to Ellen's show and leaves the audience breathless. They talk about Channing's standing in for Jimmy Kimmel on his show.

Miley Cyrus and Ariana Grande perform the song "Don't Dream It's Over" by Crowded House at One Love Manchester. The event was organized by Ariana Grande in response to the bombing after her concert at Manchester Arena.

This video showcases the California beach town Santa Cruz, famous for surfing, sun and family fun at the oldest amusement park on the U.S. west coast. The town's name is Spanish and means Holy Cross, but in its travel publicity, the town uses Cruz to mean cruising or ambling around its beaches, boardwalks, and other sights.