Sigrid explains what cardinal numbers are and gives us some writing and pronunciation tips.

After a horrific confrontation resulting in the death of one of boys, Ralph is full of remorse and appalled at what has happened to them all.

Imelda May is an Irish singer-songwriter. Her music is a mix of Neo-Rockabilly, Blues and Jazz. In this video she performs Tainted Love, written by Ed Cobb and made famous by the band Soft Cell.

Have you ever wondered what an escalator looks like on the inside, or how it works? Here's a brief demonstration.

It turns out that Rachael is also unhappy, and Maggie is feeling more and more uncomfortable about being in the middle of things.

Ordinal numbers help us put things in order or in a sequence. Sigrid teaches us the suffixes we use to turn cardinal numbers into ordinal ones.

Here is the video for the song “Colors” by Haitian-American singer Jason Derulo, which was chosen to be the anthem for the FIFA World Cup.

Maggie decides to intervene, and finally the girls are encouraged to stop sulking and talk about their issues.

Listen to the new song by American singer Ariana Grande “No Tears Left to Cry.” Dave Meyers, the director of the music video, states, "What we wanted to explore was the disorientation that you go through in life, and the quest we all go through to find the ground again."

Russia is gearing up to host the 2018 World Cup. Sarah Rainsford and Steve Rosenberg, the BBC’s Moscow correspondents, take us on a tour of Sochi, Volgograd, and Saransk, where we can see the stadiums that have been constructed and get a sense of each town.

K'naan is a Somali-Canadian poet, rapper, singer, songwriter, and multi-instrumentalist. Here, he performs a version of his hit song "Wavin' Flag" from his album entitled “Troubadour."

Dates are usually expressed with ordinal numbers. Sometimes, though, what we write is different from what we say.

Ralph and Piggy go to Jack in the hopes of getting Piggy's glasses back and settling things like adults.

"Need You Now" is a Grammy-award-winning country pop song performed by American country music trio Lady Antebellum. It tells the familiar story of being lonely enough to make a late night phone call you might regret the next day.

We continue our tour of Russian cities hosting the 2018 World Cup. We're taken to Kazan, Rostov, and Ekaterinburg.