The letter "R" is difficult to pronounce for lots of people, even native speakers. Sigrid shows us how "R" sounds in different kinds of words.

Barbadian singer Rihanna is one of the best-selling artists of all time. Here, she performs "Stay," an intimate, melancholy piano ballad from her seventh album Unapologetic. It also features Mikky Ekko on the vocals.

A look at the communications of Humpback Whales and other baleen whales, which includes how they sing, why they sing, and why we might consider their vocalizations actual songs.

Experience kiteboarding on a secluded beach in Kenya with Hawaii-native and world-class kiteboarder Shawn Richman. Lamu Island's Kizingoni Beach is the perfect spot for Shawn to let go in the wind and the waves.

Optimus Search helps companies find the right people for the job in the specific fields of Life Science, Engineering, Digital, and Energy. The consulting firm considers itself the best in the business.

This song is from Katie Melua's seventh studio album, In Winter. Melua wrote the music and lyrics with Joel Harries. The enchanting animation was created by Karni & Saul of Sulkybunny.

In the first of a new TED-Ed series designed to catalyze curiosity, TED Curator Chris Anderson shares his boyhood obsession with quirky questions that seem to have no answers.

There's friction between Ralph and Jack, with Ralph wanting to keep the spirits up among the boys and Jack taking a more pessimistic view on their situation and rescue. Ralph calls for greater discipline and highlights the need to fish and hunt for food.

The letter "S" has a couple of different sounds. It's a very important letter because it's used to form the plural of many nouns as well as the third person singular of verbs.

"Issues" is the very personal debut single by American singer and songwriter Julia Michaels, recorded for her extended play, Nervous System. The song received a Grammy Award nomination for Song of the Year at the 60th Annual Grammy Awards.

Egyptian athlete Omar El Ghazaly, a discus thrower and competitor in the Olympics, talks about his sport and his motivations.

Bruno Mars talks about his musical background and his collaboration with Philip Lawrence. They started working together in Los Angeles and their collaboration has led to numerous recordings, concerts, and awards. Both artists are Grammy-winners. Music critic Sarah Rodman wrote that Bruno Mars has an “indefatigable ecstatic approach to performing.”

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.

The boys make preparations for hunting wild boar while a delirious Captain Benson runs away from Simon, his minder.

Ed Sheeran delivers his love song “Perfect” in a wintery wonderland. The romantic ballad is about falling in love with his girlfriend, Cherry Seaborn. Despite the thick orchestral accompaniment, and some UK pronunciations, such as in "grass" and "dancing," the song has a country western feel to it. In the video, Sheeran's girlfriend is portrayed by the actress Zoey Deutch.