Fighting climate change is much like long-distance running: a complex journey filled with obstacles, fast-changing conditions and the need for constant adaptation. Drawing on his own experience as an ultramarathon runner, energy expert Greg de Temmerman charts a path for climate action that balances difficult choices and imperfect solutions with the need for urgent progress.

Human potential will only accelerate with AI answering questions better and faster than ever before, says Aravind Srinivas, cofounder and CEO of conversational search engine Perplexity. He examines the trends driving new AI-powered tools that nourish curiosity and creativity — and how they might usher in a new era of intellectual growth and discovery. "Knowledge does not really care about who you are, where you're from or who you have access to. Rather, what matters is the next question you're going to ask," says Srinivas.

Internet filmmaker Baron Ryan talks to himself, but he doesn't always like what he has to say. In a funny, existential play (where Ryan plays both himself and his mind), he contemplates the paradox of being a people pleaser, the efficacy of melatonin gummies and the squirming questions that keep many of us up at night.

AI researcher Youssef Nader and digital archaeologist Julian Schilliger share how they used AI to virtually "unroll" and decode the Herculaneum scrolls, burnt and buried by the eruption of Mount Vesuvius nearly 2,000 years ago. Learn how AI could help decipher a range of artifacts, revealing clues about the mysteries and achievements of the ancient world.

Environmental challenges aren't for just one political party to deal with — everyone must work together to solve them, says conservation champion Danielle Butcher Franz. Drawing on her work with young conservatives mobilizing environmental action, she shares how bridging divides and embracing shared values is the only way to tackle one of the world's biggest problems.

Success rarely happens in a straight line, with setbacks all but guaranteed along the way. What's the best way to recover? Leadership coach Amy Shoenthal lays out the four phases of the "setback cycle" and explains how to transform difficult moments into opportunities for reinvention and progress.

Can marketing transcend traditional business goals and actually be a force for good? Mastercard CMO Raja Rajamannar shares how purpose-driven initiatives — like “touch cards” for the visually impaired and debit cards that let people choose how their names appear — align profit with purpose and position businesses to create meaningful, positive change. (This conversation was hosted by TED's Whitney Pennington Rodgers.)

The option to work from home means that work truly works for everyone, says Avani Prabhakar, chief people officer of a large tech company. She explains how flexibility and asynchronous collaboration in a distributed workplace can unlock diverse global talent, level the playing field for introverts and actually increase productivity — without damaging company culture. (Made in partnership with Atlassian)

How prevalent is solar power, really? According to researcher Jenny Chase, it's already displacing fossil fuels in key energy markets around the world. She explains the rise of affordable solar power and dives into how her team tracked its rapid installation in unexpected countries, offering a vision of a brighter, more sustainable future.

Do you ever feel like time slows down when you’re bored but flies when you’re having fun? Cognitive neuroscientist Irena Arslanova explores the ways your brain and heart shape your perception of time, revealing how your heartbeat doesn’t just keep you alive — it also influences whether moments feel fleeting or stretched.