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.

"T" is for "tricky." Depending on what letters "T" is combined with or next to, it is pronounced differently. Sigrid explains and gives some examples.

Enjoy clips from ​the most popular musicals in London's world-famous West End. Les Misérables is the longest​-​running ​musical ​in this top ten group​, and of all time, in the West End.

Poet, activist, and scholar Jamaica Heolimeleikalani Osorio recites a poem about remembering her cultural roots by honoring her family and recalling their Hawaiian names. The last part of the poem is spoken in Hawaiian.

The "Shape of You" singer, Ed Sheeran talks with Ellen DeGeneres on her show about the Grammys, his girlfriend and their cats, along with his upcoming work with Beyoncé. He also discusses a cycling accident which put him out of commission for a month.

The title "Rockabye" is taken from the famous nursery-rhyme lullaby "Rock-a-bye baby on the tree top." The song is an electronic pop lullaby, and touches on the hardships of single mothers trying to bring up their babies right. It is sung by Anne-Marie in the role of the mother comforting her baby, and by Sean Paul who gives his support, singing in Jamaican English, so be on the lookout for unconventional grammar in the lines he sings.

Physicists, philosophers, and UFO enthusiasts all have ideas on how many universes there may be or if there is extraterrestrial life. Chris Anderson summarizes the theories and expects that in the coming years physicists will arrive at more answers.