This is a public service announcement of the Obama administration on ending sexual assault. President Obama is joined by Vice President Biden, Daniel Craig, Benicio Del Toro, Dulé Hill, Seth Meyers and Steve Carell.

"Frosty the Snowman" is a popular seasonal song, written by Walter "Jack" Rollins and Steve Nelson, about a snowman who comes to life and plays with the kids who built him. He knows very well he won't stay alive for long.

Annette explains three more colloquial contractions people use in everyday conversation: gotta [got to], gotcha [got you], and dunno [don't know]. She also gives us examples in context.

The letter "O" is a tricky vowel, because there are several ways to pronounce it, both when it's single and when it's double!

Here is a live performance of American singer songwriter Jack Johnson singing his hit song "Taylor". Enjoy!

At the University of Sydney, physicist Derek Muller explores the possibility of an anti-gravity wheel through a series of field tests.

This song from Schoolhouse Rock is to help kids understand about bones. Without bones, we're just blobs. It was written by George Newall and sung by Jack Sheldon.

Penny is dancing with another guy to Great Balls of Fire while Timmy shyly looks on. But then something happens... The music for the final scene is the hit song from both 1963 and 1977 Da doo ron ron. These nonsense syllables were originally intended as placeholders until lyrics for those lines could be written, but they caught on, and were kept as actual (though nonsensical) lyrics.

Anna explains when we use the present continuous, or present progressive tense and gives us some examples.

Donna teaches Timmy to dance, and in the background we hear two hits from the period: Rip it Up from 1956 and Great Balls of Fire from 1957.

Negotiating a salary is one the trickiest phases of a job interview. Here are some tips.

Penny is a 12-minute short film about a young man who wants nothing more than to dance with the girl of his dreams. The only problem is ... he can't dance.

From the emperor's council to the townspeople, everyone is pretending that the garments exist. Hopefully, someone will eventually have the courage to speak up!

Kaley Cuoco talks about the terrifying trip to New Zealand with her boyfriend's family that ended in her swinging through a canyon.

This very entertaining animated version of the classic Hans Christian Andersen tale "The Emperor's New Clothes" has a moral that is applicable in society and politics to this very day. And though looking good is important, that is most definitely not the moral of this story!