Why are some rock formations and animals found on more than one continent? The explanation dates back to the Ice Age.

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

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.

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.

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.

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.

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.

Actor Liam Neeson angrily swears revenge in this very popular ad that was aired during the Super Bowl.

Canadian singer Shawn Mendes sings a song about anxiety, something he has recently been afflicted with. Mendes is filmed supine to underscore just how vulnerable he feels when he's anxious.

In David Bowie's song "Ashes to Ashes," he refers to one of his earliest hits "Space Oddity." The video had very advanced visual effects for its time, and also shows off Bowie's eclectic visual style.

Louis Tomlinson, member of the boy band One Direction, and songwriter-singer Bebe Rexha have teamed up with DJ and record producer Digital Farm Animals for this song about dysfunctional relationships.

Take the pledge to Follow the Frog.
What does it mean to #followthefrog? Choose Rainforest Alliance certified products with the green frog seal.

"Bad Romance" is one of Lady Gaga's most famous hits. The video is known for its storyboard, costumes, and choreography.

A very young Mick Jagger is sending fans into delirium on The Ed Sullivan Show.

The song appeared on Prince's album “Parade” and was a worldwide hit. NME puts “Kiss” at number 4 on their Greatest Songs of All Time list.