In a passionate monologue, Linus explains what Christmas is really all about.

Catch glimpses of sockeye salmon, also called red salmon, as they make their way upstream in a migration known as the "red flood." Also included is footage of dippers, which are some of the only songbirds that search for food on the bottom of a body of water.

The big day arrives and the gymnastics finals begin. Robin is a ball of nerves, but Tommy is there to support her.

This video will teach you the different pronunciations of the word "the" in American English and when they are used.

The song "Firework" from singer Katy Perry's third studio album sold over 7 million copies in the United States. The music video was filmed in Budapest and was nominated one of the top 50 videos of the year.

The kids try to catch snowflakes on their tongues, and Linus once again proves to be wise beyond his years.

The Great Barrier Reef is the world's largest coral reef system and one of the most diverse and rich ecosystems on the planet. It is now in great danger, as the Australian and Queensland governments are giving coal companies permission to dig up coal and ship it out through the Great Barrier Reef.

With "What Do You Mean?" Justin Bieber became the youngest male pop star in music history to debut at number one on the Billboard Hot 100 chart.

The boys decide to go to Long Beach in order to keep lying to Penny.

John Lennon's last live performance, filmed at the "Salute to Lew Grade" on April 18, 1975.

Shakira, singer and UNICEF Goodwill Ambassador, performs at the opening ceremony of the Sustainable Development Goals Summit at the General Assembly of the United Nations, 70th session.

In order to fatten up before winter sets in, brown bears feast upon salmon migrating upstream to spawn. Enjoy!.

The meet takes an unexpected turn and Leah is more smug than ever, but Robin gets some extra encouragement from her friends.

"Every Breath You Take" is a song recorded by the London-based band the Police. It was written by Sting and was nominated that year for several Grammy awards. Enjoy!

For the video for her song "Bad Blood," Taylor Swift had many of her famous friends make cameos. Their work paid off - it won video of the year at the 2015 MTV Video Music Awards!