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.

The more you think about it, the more complex time travel seems! This video explains a key paradox that is one of the main reasons for this.

The whole cast got to break out of their routine and enjoy roles in the many fantasy sequences that were a feature of the show. Often based on iconic stage and screen performances, some actors were able to live out their personal acting fantasies and play parts they had always dreamed of.

American singer songwriter, rapper, producer and comedian Oliver Tree goes through his fridge and introduces us to some of the unhealthiest, most sugary food available, all forming part of his surprising new weight loss diet.

The basement film set and its contents have taken a battering over the years of filming. Now that the show is coming to an end, the actors are dividing up the props, keen to take a memento from the studio that has become a home away from home.

At eighteen years old, Billie Eilish is the youngest performer to ever sing the theme song for a James Bond film. She thrills us with a ballad containing all the dramatic tension that we’ve come to expect from this now classic genre.

Ross wants to be happier in the coming year, and makes a resolution to do one new thing every day. Joey wants to learn guitar, while Phoebe and Chandler make slightly more challenging resolutions...

Mike Myers concludes his comedic yet personal and moving tribute to actor Sean Connery on the night he receives a lifetime achievement award from the American Film Institute.

What exactly is it that makes Yabla such a fun and effective language learning tool? Amy explains what she enjoys about using Yabla, and how we can gain the most from the experience.

Christmas falls during Australia's summer, when it's quite hot in certain areas of the country. Therefore, it makes sense of Santa Claus to take a jet ski rather than a sleigh, especially in this event to raise money for underprivileged children.

Singers Kelly Clarkson, Trisha Yearwood, and Rebe McEntire give a dazzling performance of a classic song that takes us to the very heart of the Christmas story. The lyrics describe how Jesus was born one night in Bethlehem. The heavenly angels sang, and shepherds were first to hear the good news and witness the glorious sight.

Here is American superstar Miley Cyrus with a live performance of her hit song “Slide Away.” Many suppose that the lyrics refer to the dissolution of her marriage to actor Liam Hemsworth, as she finds a mature outlook on life and a change from her party girl image.

National Geographic filmed South African penguins in their natural habitat. One penguin turns to crime in order to furnish the nest and keep his mate happy.

After Victoria became Queen, English children’s names became really weird. A girl called Never… a boy called Toilet… For one poor teacher, taking the class register is almost impossible!

The cast recall their favorite moments of a show that didn’t mind pushing the boundaries. A cartoon episode was made, and the “three-sixty” scenes were a huge hit — to the extent that they often weren't even related to the storyline.