Did you know you go on a journey every night after you close your eyes? Sleep scientist Matt Walker breaks down the difference between REM (Rapid-Eye Movement) and non-REM sleep, what occurs during each stage of sleep -- and why it's important to get enough of both.

Poet and policymaker Aaron Maniam describes how the language we use to explain COVID-19 shapes the way we think about it -- whether it's as a "war," a "journey" or, as he suggests, an "ecology." He encourages us to explore a range of imaginative, interlocking metaphors to gain a deeper understanding of the pandemic -- and shows how this can help us to envision a better, more inclusive future. (This virtual conversation, hosted by TED's head of curation Helen Walters and arts and design curator Chee Pearlman, was recorded June 10, 2020.)

Crisis interventions often focus on a single aspect of a big, complicated problem, failing to address the broader social and economic context. Kwame Owusu-Kesse describes how the Harlem Children's Zone is taking a more holistic approach to the pandemic, weaving together a network of services to help communities recover and rebuild. Learn more about their comprehensive COVID-19 relief and recovery response focused on five primary areas of need -- and their plans to scale it across the US. (This ambitious plan is a part of the Audacious Project, TED's initiative to inspire and fund global change.)

Caffeine wakes you up, and alcohol makes you nod off, right? It's not that simple. Sleep scientist Matt Walker takes us into the eye-opening ways that these drinks affect the quantity and quality of our sleep.

Yann LeCun, the chief AI scientist at Facebook, helped develop the deep learning algorithms that power many artificial intelligence systems today. In conversation with head of TED Chris Anderson, LeCun discusses his current research into self-supervised machine learning, how he's trying to build machines that learn with common sense (like humans) and his hopes for the next conceptual breakthrough in AI.

Far-UVC light is a type of ultraviolet light that kills microbes and viruses and, crucially, seems to be safe to use around humans. Radiation scientist David Brenner describes how we could use this light to stop the spread of SARS-CoV-2, the virus responsible for COVID-19, in hospitals, nursing homes, trains and other public indoor spaces -- paving the way for a potentially game-changing tool in the fight against the coronavirus pandemic. (This virtual conversation, hosted by TED science curator David Biello, was recorded July 7, 2020.)

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