Julia and Rachael are young American women living in Berlin. Maggie, a friend of theirs from the United States, is coming for a visit. They are pretty excited about Maggie's arrival.

"U" is an interesting vowel, and has a few different sounds. It can even sound like the consonant "Y," and combines with other vowels to make new sounds.

Fuse School: Learn the basics about the effects of global warming on the environment. Some of the problems global warming may cause are changing climate, extremes of weather, problems for ecosystems, rising sea levels, and ocean acidification.

Annette sharpens her skydiving skills in a vertical wind tunnel in Slovakia. The wind reaches a speed of 180 kilometers per hour (112 mph).

Sigrid gives a quick explanation of what Yabla is and how the Yabla player works.

Charlie Brown and Linus have been instructed by Lucy to find a Christmas tree for a play they are going to put on, so they go searching for one.

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.