It's a master class in collaboration as violinist Robert Gupta and cellist Joshua Roman perform Halvorsen's "Passacaglia" for violin and viola. Roman takes the viola part on his Stradivarius cello. It's powerful to watch the two musicians connect moment to moment (and recover from a mid-performance hiccup). The two are both TED Fellows, and thei...

Cellist Maya Beiser plays a gorgeous eight-part modern etude with seven copies of herself, and segues into a meditative music/video hybrid -- using tech to create endless possibilities for transformative sound. Music is Steve Reich's "Cello Counterpoint," with video from Bill Morrison, then David Lang's "World to Come," with video by Irit Batsry.

Caroline Lavelle plays the cello like a sorceress casting a spell, occasionally hiding behind her wild mane of blond hair as she sings of pastoral themes. She performs "Farther than the Sun," backed by Thomas Dolby on keyboards.

The three Ahn sisters (cellist Maria, pianist Lucia, violinist Angella) breathe new life into the piano trio with their passionate musicmaking. At TEDWomen, they start with the bright and poppy "Skylife," by David Balakrishnan, then play a gorgeous, slinky version of "Oblivion," by Astor Piazzolla.

Multidisciplinary artist and TED Fellow Paul Rucker has developed his own style of cello; he puts chopsticks between his strings, uses the instrument as a drum and experiments with electronics like loop pedals. Moving between reflective storytelling and performance, Rucker shares his inspiration -- and definitely doesn't play the same old Bach.

A new virus emerges and spreads like wildfire. In order to contain it, researchers must first collect data about who's been infected. Two main viral testing techniques are critical: one tells you if you have the virus and the other shows if you've already had it. So, how exactly do these tests work? Cella Wright explores the science of PCR tests...

Is it a fuzzy sock? An overripe banana? A moldy tube of toothpaste? In fact, it's a humble sea cucumber: a brainless, fleshy form surrounding a digestive tract, and bookended by a mouth and an anus. And while it might look odd, its daily toil paves the way for entire ecosystems to thrive. Cella Wright journeys to the bottom of the ocean to explo...

An engineer with Google (he helped build Google Earth), Bruno Bowden is also an enthusiastic folder of paper.

From Chopin to Handel and everything in between -- immerse yourself in the world of classical music.

Harmoniously weaving together the art of dance and the science of mechanical engineering, Huang Yi performs a man-machine dance duet with KUKA -- a robot he conceptualized and programmed -- set to stirring cello by Joshua Roman.

With grace and energy, musicians (and siblings) Sheku Kanneh-Mason and Isata Kanneh-Mason perform a dazzling arrangement of "The Muse" by Russian composer Sergei Rachmaninov for cello and piano, followed by "Spring Song" by British composer Frank Bridge.

Robert Gupta, violinist with the LA Philharmonic, talks about a violin lesson he once gave to a brilliant, schizophrenic musician -- and what he learned. Called back onstage later, Gupta plays his own transcription of the prelude from Bach's Cello Suite No. 1.

Globe-trotting, genre-hopping cellist Rufus Cappadocia plays the music of our sphere.

Equally talented on cello and vocals, Caroline Lavelle has created a performance style all her own. Her expansive talents, channeling the best of both classical and contemporary influences, have earned her comparisons to both Kate Bush and Jacqueline du Pré.

Estamos pescando más rápido que la capacidad de los peces de repoblar los mares, convirtiendo a nuestros océanos en zonas muertas. Pero el ecologista marino Enric Sala tiene un plan radical para salvar a los océanos y al mismo tiempo potenciar la industria pesquera. Él propone crear una reserva marina gigante que cubriría dos tercios de la super...

Would you choose to build a house on top of an unfinished foundation? Of course not. Why, then, do we rush students through education when they haven't always grasped the basics? Yes, it's complicated, but educator Sal Khan shares his plan to turn struggling students into scholars by helping them master concepts at their own pace.

Ethel is, perhaps, the first 21st-century realization of the classical string quartet.

It's time for liberals and conservatives to transcend their political differences and really listen to each other, says political pundit Sally Kohn. In this optimistic talk, Kohn shares what she learned as a progressive lesbian talking head on Fox News. It’s not about political correctness, she says, but rather, emotional correctness. (Contains ...

How do you deal with a bully without becoming a thug? In this wise and soulful talk, peace activist Scilla Elworthy maps out the skills we need -- as nations and individuals -- to fight extreme force without using force in return. To answer the question of why and how nonviolence works, she evokes historical heroes -- Aung San Suu Kyi, Mahatma G...

We're all against hate, right? We agree it's a problem -- their problem, not our problem, that is. But as Sally Kohn discovered, we all hate -- some of us in subtle ways, others in obvious ones. As she confronts a hard story from her own life, she shares ideas on how we can recognize, challenge and heal from hatred in our institutions and in our...

Doesn't it seem like a lot of online news sites have moved beyond reporting the news to openly inciting your outrage (and your page views)? News analyst Sally Kohn suggests — don't engage with news that looks like it just wants to make you mad. Instead, give your precious clicks to the news sites you truly trust.

What if we could save the fishing industry and protect the ocean at the same time? Marine ecologist Enric Sala shares his bold plan to safeguard the high seas -- some of the last wild places on earth, which fall outside the jurisdiction of any single country -- by creating a giant marine reserve that covers two-thirds of the world's ocean. By pr...

Enric Sala shares glorious images -- and surprising insights and data -- from some of the most pristine areas of the ocean. He shows how we can restore more of our oceans to this healthy, balanced state, and the powerful ecological and economic benefits of doing so.

As a diver in the 1970s, marine ecologist Enric Sala saw once-lush oceanscapes reduced to underwater deserts -- but later, in marine preserves across the globe, he also witnessed the ocean's power to rejuvenate itself when left to its own natural devices. Could rewilding the planet help us restore biodiversity and reduce the impacts of climate c...

Inventor and MacArthur fellow Saul Griffith shares some innovative ideas from his lab -- from "smart rope" to a house-sized kite for towing large loads.

From Beyoncé to Drake and beyond, the world is rocking to the rhythm of Afrobeat. Feel the music as Kenyan afro-pop superstars Sauti Sol take the TED stage to perform three songs: "Live and Die in Afrika," "Sura Yako" and "Kuliko Jana."

In this brief talk, Saul Griffith unveils the invention his new company Makani Power has been working on: giant kite turbines that create surprising amounts of clean, renewable energy.

Salman Khan talks about how and why he created the remarkable Khan Academy, a carefully structured series of educational videos offering complete curricula in math and, now, other subjects. He shows the power of interactive exercises, and calls for teachers to consider flipping the traditional classroom script -- give students video lectures to ...

We can't control if we'll die, but we can "occupy death," in the words of Peter Saul, an emergency doctor. He asks us to think about the end of our lives -- and to question the modern model of slow, intubated death in hospital. Two big questions can help you start this tough conversation.

Chris Milk uses innovative technologies to make personal, interactive, human stories. Accompanied by Joshua Roman on cello and McKenzie Stubbert on piano, Milk traces his relationship to music and art -- from the first moment he remembers putting on headphones to his current work creating breakthrough virtual reality projects. VR is the last med...