The Valentine’s Day live edition of "Fun with Flags" continues, as does Sheldon’s irritation with the show’s callers. They just don’t want to talk about flags, and, more importantly, he’s not the only one speaking! He goes into a big sulk, but Amy gets him to open up and we suddenly glimpse a different, almost romantic side of Sheldon.

A change of location and a new house band all add to the spectacle of Sheldon and Amy's show "Fun with Flags." Sheldon hopes that this new spirit of togetherness, along with a theme of regions uniting under a flag, will broaden the show’s rather limited audience.

Sheldon regrets rashly offering Leonard the option of taking any item he wants from the apartment. Leonard takes the apartment's official flag, which Sheldon designed, and uses it to torment Sheldon.

This animated video shows how tuberculosis, still a very common disease, spreads and is fought by our bodies. Find out more about MSF’s work treating tuberculosis around the world.

How do you transport life-saving medicines that need to be kept cold to remote communities, even across deserts or through dense jungles? Find out more about the cold chain process.

From the soundtrack of Disney’s enormously successful movie Frozen, the song “Do You Want to Build a Snowman?” caught the imagination of the world, as a lonely Anna desperately implores Elsa to spend time with her.

Watch the full “Into the Unknown” sequence from Disney’s Frozen 2 featuring the original song performed by Idina Menzel (voice of Elsa) featuring AURORA and written by Academy Award winners Kristen Anderson-Lopez & Robert Lopez.

In this song from the movie Descendants 3, Sarah Jeffrey sings in her role as a princess who listens to the devil on her shoulder and becomes the evil “Queen of Mean.”

The seemingly normal Miley Stewart has a secret identity. She's the famous teen pop sensation, Hannah Montana!

Alex, Justin, and Max Russo have something to hide - they're secretly wizards in training!

Best friends CeCe and Rocky have landed roles as dancers on a local dance show "Shake It Up, Chicago!"

Zack and Cody Martin are trouble-making twins living the Suite Life at the Tipton Hotel.

In this video, five-time World Champion Paige Pierce gives some pointers for throwing a backhand in disc golf.

Disc golf World Champion Paige Pierce focuses on the mechanics of a good backhand throw, from body weight transfer to follow through... and her lesson already seems to be yielding results!

Combining all Paige’s techniques into one seamless fluid motion is going to take some practice! The disc golf world champion also has advice on which discs are best for a beginner.