Who runs the world? Political scientist Ian Bremmer argues it's not as simple as it used to be. With some eye-opening questions about the nature of leadership, he asks us to consider the impact of the evolving global order and our choices as participants in the future of democracy.

In between two songs that showcase her raw vocal powers, singer-songwriter Jessie Reyez delivers an inspiring talk about how she's turned wins into losses -- and reminds us we're all capable of magic. (This talk contains mature language.)

Nearly half of all pregnancies in the United States are unplanned, the result of millions of people being unable to get the birth control method that works best for them. Reproductive health advocate and 2023 Audacious Project grantee Mark Edwards discusses Upstream USA's nationwide effort to expand access to high-quality contraceptive care by integrating it into primary health-care settings -- a crucial shift towards increasing equal health opportunities and empowering people to decide when and if they want to start families. (This ambitious idea is a part of the Audacious Project, TED's initiative to inspire and fund global change.)

If we're going to solve the climate crisis, we need to talk about construction. The four main building materials that humans currently use -- concrete, steel, masonry and wood -- have a heavy environmental impact, but what if we had a fifth option? Architect Michael Green proposes an entirely new, natural medium inspired by the structure of trees and plants. Learn more about the carbon-sequestering solution to our construction conundrum that's laying the groundwork for a truly sustainable future.

Pirate fishing, oil spills and other undetected crimes are destroying ocean ecosystems -- but we can't stop what we can't see. Harnessing the power of satellite data and AI to catch maritime offenders in the act, ocean conservation expert and 2023 Audacious Project grantee Tony Long introduces the first-ever live map of all industrial human activity at sea. He shares how his team at Global Fishing Watch is making it freely available to the world so conservationists, researchers and the public can help protect precious aquatic habitats. (This ambitious idea is a part of the Audacious Project, TED's initiative to inspire and fund global change.)

Our bodies instinctually respond to the movements and rhythms of nature, like the uplifting feeling you get when walking in a forest. Can art evoke the same emotions? Experiential artist Lonneke Gordijn takes us through her studio's stunning, nature-inspired work -- flowering lights, murmurating drones -- and reveals a mysterious piece hiding in the shadows of the TED Theater that just might change your relationship with concrete.

Modern life runs on wireless technology. What if the energy powering our devices could also be transmitted without wires? Electrical engineer Ali Hajimiri explains the principles behind wireless energy transfer and shares his far-out vision for launching flexible solar panels into space in order to collect sunlight, convert it to electrical power and then beam it down to Earth. Learn how this technology could power everything -- and light up our world from space.

Drawing on his work reconstructing the vocal tract of an ancient Egyptian priest, speech scientist David M. Howard shares three evolutionary wonders of human speech -- and the importance of nurturing your own voice in an increasingly noisy world.