The common thinking on biological sex goes like this: females have two X chromosomes in their cells, while males have one X and one Y. In this myth-busting talk, science writer and podcaster Molly Webster shows why the so-called "sex chromosomes" are more complicated than this simple definition -- and reveals why we should think about them differently.

To work safely, self-driving cars must avoid obstacles -- including those just out of sight. And for this to happen, we need technology that sees better than humans can, says electrical engineer David Lindell. Buckle up for a quick, groundbreaking tech demo as Lindell explains the significant and versatile potential of a high-speed camera that can detect objects hidden around corners.

"Life's beauty is inseparable from its fragility," says psychologist Susan David. In a special virtual conversation, she shares wisdom on how to build resilience, courage and joy in the midst of the coronavirus pandemic. Responding to listeners' questions from across the globe, she offers ways to talk to your children about their emotions, keep focus during the crisis and help those working on the front lines. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded March 23, 2020)

The world is more connected than ever, but some communities are still cut off from vital resources like electricity and health care. In this solution-oriented talk, activist Johanna Figueira discusses her work with Code for Venezuela -- a platform that gathers technologists to address Venezuela's needs for information and medical supplies -- and shares ideas for how it could be used as a model to help other communities in need.

Philanthropist and Microsoft cofounder Bill Gates offers insights into the COVID-19 pandemic, discussing why testing and self-isolation are essential, which medical advancements show promise and what it will take for the world to endure this crisis. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded March 24, 2020)

What's your passion? Social entrepreneur Noeline Kirabo reflects on her work helping out-of-school young people in Uganda turn their passions into profitable businesses -- and shares the two questions you can ask yourself to begin doing the same.

To tackle a problem as large as climate change, we need both science and Indigenous wisdom, says environmental activist Hindou Oumarou Ibrahim. In this engaging talk, she shares how her nomadic community in Chad is working closely with scientists to restore endangered ecosystems -- and offers lessons on how to create more resilient communities.

When will the coronavirus vaccine be ready? Epidemiologist Seth Berkley (head of Gavi, the Vaccine Alliance) takes us inside the effort to create a vaccine for COVID-19. With clarity and urgency, he explains what makes it so challenging to develop, when we can expect it to be rolled out at scale and why we'll need global collaboration to get it done. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded March 26, 2020)

From Hong Kong, South China Morning Post CEO Gary Liu tracks China's response to the coronavirus pandemic -- from the initial outbreak in Wuhan to the shutdown of Hubei province and the containment measures taken across its major cities. Sharing insights into how the culture in places like Hong Kong and South Korea contributed to fast action against the virus, Liu identifies lessons people across the world can use to stop its spread. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded March 25, 2020)

Author Priya Parker shares tools for creating meaningful connections with friends, family and coworkers during the coronavirus pandemic -- and shows how we can take advantage of gatherings that are unique to this moment of social distancing. "We don't necessarily need to gather more," she says. "We need to gather better." (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded March 27, 2020)

Pardons, commutations and bankruptcy laws are all tools of forgiveness within the US legal system. Are we using them frequently enough, and with fairness? Law professor Martha Minow outlines how these merciful measures can reinforce racial and economic inequality -- and makes the case for creating a system of restorative justice that focuses on accountability and reconciliation rather than punishment.

Rabbi Lord Jonathan Sacks offers thoughts on how we can navigate the coronavirus pandemic with courage, hope and empathy. With wisdom and clarity, he speaks on leadership, fear, death, hope and how we could use this moment to build a more just world. Watch for a special, impromptu prayer about halfway through the conversation. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and head of curation Helen Walters. Recorded March 30, 2020)

Monarch butterflies are dying at an alarming rate around the world -- a looming extinction that could also put human life at risk. But we have just the thing to help save these insects, says author Mary Ellen Hannibal: citizen scientists. Learn how these grassroots volunteers are playing a crucial role in measuring and rescuing the monarch's dwindling population -- and how you could join their ranks to help protect nature. (You'll be in good company: Charles Darwin was a citizen scientist!)

What can past pandemics teach us how to tackle the current one? Tracing the history of contagions from cholera to Ebola and beyond, science journalist Sonia Shah explains why we're more vulnerable to outbreaks now than ever before, what we can do to minimize the spread of coronavirus and how to prevent future pandemics. (This virtual conversation is part of the TED Connects series, hosted by science curator David Biello and current affairs curator Whitney Pennington Rodgers. Recorded March 31, 2020)

A good night's sleep has perhaps never been more important. Sharing wisdom and debunking myths, sleep scientist Matt Walker discusses the impact of sleep on mind and body -- from unleashing your creative powers to boosting your memory and immune health -- and details practices you can start (and stop) doing tonight to get some rest. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded April 1, 2020)

"Autism is not a disease; it's just another way of thinking," says Ethan Lisi. Offering a glimpse into the way he experiences the world, Lisi breaks down misleading stereotypes about autism, shares insights into common behaviors like stimming and masking and promotes a more inclusive understanding of the spectrum.

If you're feeling anxious or fearful during the coronavirus pandemic, you're not alone. Offering hope and understanding, author Elizabeth Gilbert reflects on how to stay present, accept grief when it comes and trust in the strength of the human spirit. "Resilience is our shared genetic inheritance," she says. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and head of curation Helen Walters. Recorded April 2, 2020)

More barriers exist now than at the end of World War II, says designer Alexandra Auer. And when you erect one wall, you unwittingly create a second -- an "us" versus "them" partition in the mind that compromises our collective safety. With intriguing results from her social design project focused on two elementary schools separated by a fence, Auer encourages us to dismantle our biases and regain perspective on all the things we have in common.

There's a simple and powerful way to confront the world's most pressing crises, says women's rights activist Yifat Susskind: think like a mother. As she puts it: "When you think like a mother, you prioritize the needs of the many, not the whims of the few." Follow along as she shares moving stories of people around the world who embody this mindset -- and shows how it can also help you see beyond suffering and act to build a better world.

As COVID-19 continues to spread, the world is facing two existential threats at once: a public health emergency and an economic crisis. Political theorist Danielle Allen describes how we can ethically and democratically address both problems by scaling up "smart testing," which would track positive cases with peer-to-peer software on people's cell phones -- so we can end the pandemic and get back to work. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and business curator Corey Hajim. Recorded April 6, 2020)

Indigenous languages across North America are under threat of extinction due to the colonial legacy of cultural erasure, says linguist Lindsay Morcom. Highlighting grassroots strategies developed by the Anishinaabe people of Canada to revive their language and community, Morcom makes a passionate case for enacting policies that could protect Indigenous heritage for generations to come.

The coronavirus pandemic is unlike anything we've ever seen in health care, says emergency physician Esther Choo. Sharing insights into how health workers are responding to the outbreak, she explains what makes this public health emergency different from others -- and provides a few simple things you can do to help. Watch to the end to hear about Choo's work deploying mobile ICUs across the United States as hospitals start to reach capacity. (This virtual conversation is part of the TED Connects series, hosted by current affairs curator Whitney Pennington Rodgers and head of curation Helen Walters. Recorded April 7, 2020)

To understand what makes marriages work, we need to talk about why they sometimes end, says family law professor Jeannie Suk Gersen. Follow along as she lays out three ways that thinking about marital decisions through the lens of divorce can help you better navigate togetherness from the beginning.

Looking to put your skills to use to fight the pandemic? Consider joining The Global Hack, a virtual hackathon designed to rapidly develop solutions to the coronavirus crisis. Designer and technologist Marko Russiver shares the motivation behind a movement looking to help people build post-pandemic resilience. (This virtual conversation is part of the TED Connects series, hosted by head of curation Helen Walters. Recorded April 8, 2020)

"I'm a capitalist. I believe in the system. I believe you can increase the size of the pie and you could divide it well," says Ray Dalio, founder of Bridgewater Associates. He offers wide-ranging insight and advice on how we might recover from the global economic fallout of the coronavirus crisis -- and use it as an opportunity to reform the systems that help grow our economy. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and business curator Corey Hajim. Recorded April 8, 2020)

The coronavirus pandemic put India's population of 1.3 billion into an extreme and sudden lockdown. Social entrepreneur Gayathri Vasudevan explains how the situation is impacting the country's migrant workers, who are stuck far from home with limited access to food and shelter, and calls for an overhaul of India's social infrastructure in order to get people the essentials they need right now. (This virtual conversation is part of the TED Connects series, hosted by current affairs curator Whitney Pennington Rodgers. Recorded April 9, 2020)

The coronavirus pandemic is more global, dramatic and unusual than any crisis we've seen in a long time, says journalist Fareed Zakaria. Listen as he shares his perspective on how we can recover from the economic fallout, why certain countries were able to avoid major outbreaks and what this might mean for the balance of global power. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anderson and current affairs curator Whitney Pennington Rodgers. Recorded April 9, 2020)

Did you know that one of the most notorious poisons is also a key ingredient for life as we know it? Join space chemist Karin Öberg and learn how she scans the universe in search of this paradoxical chemical using ALMA, the world's largest radio telescope, to detect hotbeds of molecular activity and the formation of life-sustaining planets.

Some biological structures are so small that scientists can't see them with even the most powerful microscopes. That's where molecular animator and TED Fellow Janet Iwasa gets creative. Explore vast, unseen molecular worlds as she shares mesmerizing animations that imagine how they might work.

Curious how stuff works? Do a hands-on experiment at home, says physicist Nadya Mason. She shows how you can demystify the world around you by tapping into your scientific curiosity -- and performs a few onstage experiments of her own using magnets, dollar bills, dry ice and more.

Racism makes our economy worse -- and not just in ways that harm people of color, says public policy expert Heather C. McGhee. From her research and travels across the US, McGhee shares startling insights into how racism fuels bad policymaking and drains our economic potential -- and offers a crucial rethink on what we can do to create a more prosperous nation for all. "Our fates are linked," she says. "It costs us so much to remain divided."

When Shaka Senghor and Ebony Roberts ended their relationship, they made a pact to protect their son from its fallout. What resulted was a poetic meditation on what it means to raise a child together, yet apart. In this moving and deeply personal talk, Senghor and Roberts share their approach to co-parenting -- an equal, active partnership that rolls with the punches and revels in the delights of guiding their child through the world with thought and intention.

How does your genetic inheritance, culture and history influence your health? Biological anthropologist Lara Durgavich discusses the field of evolutionary medicine as a gateway to understanding the quirks of human biology -- including why a genetic mutation can sometimes have beneficial effects -- and emphasizes how unraveling your own evolutionary past could glean insights into your current and future health.

Recounting her story of finding opportunity and stability in the US, Elizabeth Camarillo Gutierrez examines the flaws in narratives that simplify and idealize the immigrant experience -- and shares hard-earned wisdom on the best way to help those around us. "Our world is one that flourishes when different voices come together," she says.

If you had to explain to a newborn what it means to be a human being living on Earth in the 21st century, what would you say? Visual artist Oliver Jeffers put his answer in a letter to his son, sharing pearls of wisdom on existence and the diversity of life. He offers observations of the "beautiful, fragile drama of human civilization" in this poetic talk paired with his original illustrations and animations.

When it comes to big life problems, we often stand at a crossroads: either believe we're powerless against great change, or we rise to meet the challenge. In an urgent call to action, political strategist Tom Rivett-Carnac makes the case for adopting a mindset of "stubborn optimism" to confront climate change -- or whatever crisis may come our way -- and sustain the action needed to build a regenerative future. As he puts it: "Stubborn optimism can fill our lives with meaning and purpose."

Examining the facts and figures of the coronavirus outbreak, epidemiologist Larry Brilliant evaluates the global response in a candid interview with head of TED Chris Anderson. Brilliant lays out a clear plan to end the pandemic -- and shows why, to achieve it, we'll have to work together across political and geographical divides. "This is not the zombie apocalypse; this is not a mass extinction event," he says. "We need to be the best version of ourselves." (Recorded April 22, 2020)

What if we could help people in crisis anytime, anywhere with a simple text message? That's the idea behind Crisis Text Line, a free 24-hour service that connects people in need with trained, volunteer crisis counselors -- "strangers helping strangers around the world, like a giant global love machine," as cofounder and CEO Nancy Lublin puts it. Learn more about their big plans to expand to four new languages, providing a third of the globe with crucial, life-saving support. (This ambitious plan is a part of the Audacious Project, TED's initiative to inspire and fund global change.)

Many countries have an active, centuries-old law that allows government agencies to take your things -- your house, your car, your business -- without ever convicting you of a crime. Law researcher Dick M. Carpenter II exposes how this practice of civil forfeiture threatens your rights and creates a huge monetary incentive for law enforcement to pocket your possessions -- and he lays out a path to end "policing for profit" once and for all.

What if we could harness the ocean's movement to protect coastal communities from rising sea levels? Designer and TED Fellow Skylar Tibbits shows how his lab is creating a dynamic, adaptable system of underwater structures that uses energy from ocean waves to accumulate sand and restore eroding shorelines -- working with the forces of nature to build rather than destroy.

Before the coronavirus pandemic, bioengineer Jim Collins and his team combined the power of AI with synthetic biology in an effort to combat a different looming crisis: antibiotic-resistant superbugs. Collins explains how they pivoted their efforts to begin developing a series of tools and antiviral compounds to help fight COVID-19 -- and shares their plan to discover seven new classes of antibiotics over the next seven years. (This ambitious plan is a part of The Audacious Project, TED's initiative to inspire and fund global change.)

Health care workers are under more stress than ever before. How can they protect their mental health while handling new and complex pressures? TED Fellow Laurel Braitman shows how writing and sharing personal stories helps physicians, nurses, medical students and other health professionals connect more meaningfully with themselves and others -- and make their emotional well-being a priority.

By some estimates, work-related stress drains the US economy of nearly 300 billion dollars a year -- and it can hurt your productivity and personal health too, says wellness advocate Rob Cooke. He shares some strategies to help put your mental, physical and emotional well-being back at the forefront.

Privacy isn't dead, but face surveillance technology might kill it, says civil rights advocate Kade Crockford. In an eye-opening talk, Kade outlines the startling reasons why this invasive technology -- powered by often-flawed facial recognition databases that track people without their knowledge -- poses unprecedented threats to your fundamental rights. Learn what can be done to ban government use before it's too late.

To combat COVID-19, countries have enforced city-wide shutdowns, stay-at-home orders and mask mandates -- but the reaction (and adherence) to these rules has differed markedly in the East and West. In conversation with TED's head of curation Helen Walters, writer and publisher Huang Hung sheds light on how Chinese and American cultural values shaped their responses to the outbreak -- and provides perspective on why everyone needs to come together to end the pandemic. (Recorded April 16, 2020)

In 2011, declassified CIA documents shed light on a covert government program dating back to WWII

The British Navy knew it couldn't completely disguise a ship to protect it from attack during WWI. So they turned to 'Dazzle Painting'

Bombing ground targets from the air is tricky and not always accurate. But a new type of bomb creates an unimaginable level of destruction

The USS Silversides is patrolling the Pacific during WWII when it finds itself in a terrifying situation: one of its torpedoes has jammed

After the Napoleonic Wars caused a shortage of British Oak, frigate builders looked all over the empire for an alternative. They found one in India