TEDTalks (video)

Our universe is strange, wonderful and vast, says astronomer Natasha Hurley-Walker. A spaceship can't carry you into its depths (yet) -- but a radio telescope can. In this mesmerizing talk, Hurley-Walker shows how she probes the mysteries of the universe using special technology that reveals light spectrums we can't see.

To design the Bahá'í Temple of South America, architect Siamak Hariri focused on illumination -- from the temple's form, which captures the movement of the sun across the day, to the iridescent, luminous stone and glass used to build it. Join Hariri for a journey through his creative process as he explores what makes for a sacred experience in a secular world.

We teach girls that they can have ambition, but not too much ... to be successful, but not too successful, or they'll threaten men, says author Chimamanda Ngozi Adichie. In this classic talk that started a worldwide conversation about feminism, Adichie asks that we begin to dream about and plan for a different, fairer world -- of happier men and women who are truer to themselves.

TED Fellow Zubaida Bai works with medical professionals, midwives and mothers to bring dignity and low-cost interventions to women's health care. In this quick, inspiring talk, she presents her clean birth kit in a purse, which contains everything a new mother needs for a hygienic birth and a healthy delivery -- no matter where in the world (or how far from a medical clinic) she might be.

If Yoda goes into cardiac arrest, will you know what to do? Artist and first-aid enthusiast Todd Scott breaks down what you need to know about using an automated external defibrillator, or AED -- in this galaxy and ones that are far, far away. Prepare to save the life of a Jedi, Chewbacca (he'll need a quick shave first) or someone else in need with some helpful pointers.

Conflict is bad; compromise, consensus and collaboration are good -- or so we're told. Lawyer and bioethicist Jonathan Marks challenges this conventional wisdom, showing how governments can jeopardize public health, human rights and the environment when they partner with industry. An important, timely reminder that common good and common ground are not the same thing.

We increasingly make decisions based on short-term goals and gains -- an approach that makes the future more uncertain and less safe. How can we learn to think about and plan for a better future in the long term ... like, grandchildren-scale long term? Ari Wallach shares three tactics for thinking beyond the immediate.

Giorgia Lupi uses data to tell human stories, adding nuance to numbers. In this charming talk, she shares how we can bring personality to data, visualizing even the mundane details of our daily lives and transforming the abstract and uncountable into something that can be seen, felt and directly reconnected to our lives.

Why does race matter so profoundly for health? David R. Williams developed a scale to measure the impact of discrimination on well-being, going beyond traditional measures like income and education to reveal how factors like implicit bias, residential segregation and negative stereotypes create and sustain inequality. In this eye-opening talk, Williams presents evidence for how racism is producing a rigged system -- and offers hopeful examples of programs across the country that are working to dismantle discrimination.

We need to talk to kids about the risks they face online, says information security expert Sebastián Bortnik. In this talk, Bortnik discusses the issue of "grooming" -- the sexual predation of children by adults on the internet -- and outlines the conversations we need to start having about technology to keep our kids safe. (In Spanish with English subtitles)

At the heart of the Milky Way, there's a supermassive black hole that feeds off a spinning disk of hot gas, sucking up anything that ventures too close -- even light. We can't see it, but its event horizon casts a shadow, and an image of that shadow could help answer some important questions about the universe. Scientists used to think that making such an image would require a telescope the size of Earth -- until Katie Bouman and a team of astronomers came up with a clever alternative. Learn more about how we can see in the ultimate dark.

How can we bridge the gap between left and right to have a wiser, more connected political conversation? Journalist Gretchen Carlson and op-ed columnist David Brooks share insights on the tensions at the heart of American politics today -- and where we can find common ground. Followed by a rousing performance of "America the Beautiful" by Vy Higginsen's Gospel Choir of Harlem.

Your boss probably isn't paying you what you're worth -- instead, they're paying you what they think you're worth. Take the time to learn how to shape their thinking. Pricing consultant Casey Brown shares helpful stories and learnings that can help you better communicate your value and get paid for your excellence.

Emtithal "Emi" Mahmoud writes poetry of resilience, confronting her experience of escaping the genocide in Darfur in verse. She shares two stirring original poems about refugees, family, joy and sorrow, asking, "Will you witness me?"

Sō Percussion creates adventurous performances with new, unconventional instruments. Performing "Music for Wood and Strings" by Bryce Dessner of The National, the quartet plays custom-made dulcimer-like instruments that combine the sound of an electric guitar with the percussionist's toolkit to create a hypnotic effect.

Moshe Szyf is a pioneer in the field of epigenetics, the study of how living things reprogram their genome in response to social factors like stress and lack of food. His research suggests that biochemical signals passed from mothers to offspring tell the child what kind of world they're going to live in, changing the expression of genes. "DNA isn't just a sequence of letters; it's not just a script." Szyf says. "DNA is a dynamic movie in which our experiences are being written."

Only one in nine people in the United States gets the care and treatment they need for addiction and substance abuse. A former Director of National Drug Control Policy, Michael Botticelli is working to end this epidemic and treat people with addictions with kindness, compassion and fairness. In a personal, thoughtful talk, he encourages the millions of Americans in recovery today to make their voices heard and confront the stigma associated with substance use disorders.

Breast milk grows babies' bodies, fuels neurodevelopment, provides essential immunofactors and safeguards against famine and disease -- why, then, does science know more about tomatoes than mother's milk? Katie Hinde shares insights into this complex, life-giving substance and discusses the major gaps scientific research still needs to fill so we can better understand it.

From packing peanuts to disposable coffee cups, each year the US alone produces some two billion pounds of Styrofoam -- none of which can be recycled. Frustrated by this waste of resources and landfill space, Ashton Cofer and his science fair teammates developed a heating treatment to break down used Styrofoam into something useful. Check out their original design, which won the Scientific American Innovator Award from Google Science Fair.

Polls that predict political candidates' chances to two decimal places are a problem. But we shouldn't count out stats altogether ... instead, we should learn to look behind them. In this delightful, hilarious talk, data journalist Mona Chalabi shares handy tips to help question, interpret and truly understand what the numbers are saying.

To make the world work, we need leaders who consider the needs of every man, woman, child and animal on the planet -- not just their own voters. With the Global Vote, an online platform that lets anybody, anywhere in the world vote in the election of any country on earth, policy advisor Simon Anholt hopes to fill the gap between the few people who elect the world's most powerful leaders ... and the rest of us.

War doesn't just kill people; it destroys the institutions that keep society running, like utilities, banks and hospitals. Physician and global health policy analyst Margaret Bourdeaux proposes a bold approach to post-conflict recovery that focuses on building strong, resilient health systems that protect vulnerable populations.

We all go through challenges -- some you can see, most you can't, says Michele L. Sullivan. In a talk about perspective, Sullivan shares stories full of wit and wisdom and reminds us that we're all part of each other's support systems. "The only shoes you can walk in are your own," she says. "With compassion, courage and understanding, we can walk together, side by side."

Critical care doctor Peter Weinstock shows how surgical teams are using a blend of Hollywood special effects and 3D printing to create amazingly lifelike reproductions of real patients -- so they can practice risky surgeries ahead of time. Think: "Operate twice, cut once." Glimpse the future of surgery in this forward-thinking talk.

What happens when a mall falls into ruin? Filmmaker Dan Bell guides us through abandoned monoliths of merchandise, providing a surprisingly funny and lyrical commentary on consumerism, youth culture and the inspiration we can find in decay.