Yvonne Aki-Sawyerr, mayor of Freetown, Sierra Leone, is on a mission to plant a million trees over the next two years, increasing vegetation in her city by fifty percent while shoring up eroding riverbanks and increasing biodiversity. "This isn't just about planting trees; it's about growing trees, and it's about ensuring that each one of us is part of the process," she says. "A million trees is our city's small contribution to increasing the much-needed global carbon sink."

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The city planting a million trees in two years | Yvonne Aki-Sawyerr

"The hardest part of my cancer experience began once the cancer was gone," says author Suleika Jaouad. In this fierce, funny, wisdom-packed talk, she challenges us to think beyond the divide between "sick" and "well," asking: How do you begin again and find meaning after life is interrupted?

What almost dying taught me about living | Suleika Jaouad

With fascinating research and hilarious anecdotes, neuroscientist Camilla Arndal Andersen takes us into the lab where she studies people's sense of taste via brain scans. She reveals surprising insights about the way our brains subconsciously experience food -- and shows how this data could help us eat healthier without sacrificing taste.

What happens in your brain when you taste food | Camilla Arndal Andersen

As the coronavirus pandemic raged in her native Sri Lanka, monk JayaShri Maathaa had a thought: two magical words that planted something beautiful in her mind and blossomed into a whole new way of being. She shares how this mantra transformed her life -- and the surprising ways gratitude can invite bliss, joy and harmony between yourself and all that surrounds you.

A magical mantra for nurturing a blissful life | JayaShri Maathaa

"A record of our emotional life is written on our hearts," says cardiologist and author Sandeep Jauhar. In a stunning talk, he explores the mysterious ways our emotions impact the health of our hearts -- causing them to change shape in response to grief or fear, to literally break in response to emotional heartbreak -- and calls for a shift in how we care for our most vital organ.

How your emotions change the shape of your heart | Sandeep Jauhar

Here's a talk about tears -- and why crying isn't something to be afraid or ashamed of. Exploring the science behind the mood-boosting power of crying, childbirth and lactation educator Kathy Mendias shows how tears can enhance your physical and mental well-being and deepen your relationship to yourself and others.

The mood-boosting power of crying | Kathy Mendias

In April 2020, epidemiologist-in-training Sophie Rose volunteered to be infected with the virus that causes COVID-19. As a young, healthy adult, she's offering to take part in a human challenge trial, a study where participants are intentionally exposed to SARS-CoV-2 to test vaccines and gather critical data. Explaining how challenge trials could speed up the development of effective vaccines, Rose shares why volunteering was the right decision for her.

How COVID-19 human challenge trials work -- and why I volunteered | Sophie Rose

On a mission to create a hunger-free world, agricultural entrepreneur Cedric Habiyaremye makes the case for cultivating quinoa -- and other versatile, nutrient-rich grains -- in places experiencing malnutrition, like his native Rwanda. He shares a model to help smallholder farmers across Africa diversify their fields with nutritious and indigenous crops, taking a step towards ensuring healthy foods are available and affordable for all.

How quinoa can help combat hunger and malnutrition | Cedric Habiyaremye

An effective COVID-19 vaccine is just the first step in ending the pandemic, says global health strategist Johanna Benesty. In this illuminating talk, she explores the various barriers to "equitable access" -- making sure COVID-19 therapeutics are available to all -- and shares a creative approach to research and development that could ensure vaccines are rolled out fairly, efficiently and at a global scale.

What happens after we develop a COVID-19 vaccine? | Johanna Benesty

A historic number of Latinx voters participated in the 2020 US presidential election, including a record number of young people casting their ballots for the first time. Civic leader María Teresa Kumar takes a look at the issues closest to youth Latinx voters, including health care, climate equity and racial justice, and considers how this growing demographic could shape American politics for decades to come. Stay tuned for a Q&A with TEDx learning specialist Bianca DeJesus on why the US has a unique opportunity to harness its diversity and define the 21st century.

How the new generation of Latinx voters could change US elections | María Teresa Kumar

India has a historic opportunity to power its industrialization with clean energy -- and its energy choices will make or break the world's fight against climate change, says clean energy executive, physicist and author Varun Sivaram. Bringing on-the-ground experience as CTO of India's largest renewable energy company, Sivaram proposes a plan for India to achieve three herculean feats, all at the same time -- and reimagine its economy with renewable energy at its heart.

India's historic opportunity to industrialize using clean energy | Varun Sivaram

Activist and author Gloria Steinem is an icon of the global feminist movement. She's spent her life defying stereotypes, breaking social barriers and fighting for equality. In conversation with TEDWomen curator Pat Mitchell, Steinem reflects on the revolutionary roots of the feminist movement, the fundamental need for intersectionality to combat prejudice, and how she overcame her fears with the support of friends. Now she urges future generations of women to advocate for each other in solidarity -- and discover the freedom found in companionship and community.

To future generations of women, you are the roots of change | Gloria Steinem

How do you stand up to authoritarianism? And what does it mean to be "fearless"? In this powerful talk, housewife-turned-politician Sviatlana Tsikhanouskaya describes her unlikely bid to defeat Belarus's long-time autocratic leader in the nation's 2020 presidential election. Painting a vivid picture of how small acts of defiance flourished into massive, peaceful demonstrations, she shares a beautiful meditation on the link between fearlessness and freedom, reminding us that we all have what it takes to stand up to injustice -- we just need to do it together.

How to be fearless in the face of authoritarianism | Sviatlana Tsikhanouskaya

"Business is screwed if we don't fix climate change," says economist Rebecca Henderson. In this bold talk, she describes how unchecked capitalism destabilizes the environment and harms human health -- and makes the case for companies to step up and help fix the climate crisis they're causing. Hear what a reimagined capitalism, in which companies pay for the climate damage they cause, could look like.

To save the climate, we have to reimagine capitalism | Rebecca Henderson

In 2014, Erika Cheung made a discovery that would ultimately help bring down her employer, Theranos, as well as its founder, Elizabeth Holmes, who claimed to have invented technology that would transform medicine. The decision to become a whistleblower proved a hard lesson in figuring out how to do what's right in the face of both personal and professional obstacles. With candor and humility, Cheung shares her journey of speaking truth to power -- and offers a framework to encourage others to come forward and act in the service of all.

Theranos, whistleblowing and speaking truth to power | Erika Cheung

Every weekday, TED Talks Daily brings you the latest talks in audio. Join host and journalist Elise Hu for thought-provoking ideas on every subject imaginable — from Artificial Intelligence to Zoology, and everything in between — given by the world's leading thinkers and creators. With TED Talks Daily, find some space in your day to change your perspectives, ignite your curiosity, and learn something new.

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