How fearless women lead

Pat Mitchell has nothing left to prove and much less to lose -- she's become a "dangerous woman." Not dangerous as in feared, she says, but fearless: a force to be reckoned with. In this powerful call to action, Mitchell invites all women, men and allies to join her in embracing the risks necessary to create a world where safety, respect and truth burn brighter than the darkness of our current times.

After being diagnosed with a rare genetic condition that deteriorates muscle, Cara E. Yar Khan was told she'd have to limit her career ambitions and dial down her dreams. She ignored that advice and instead continued to pursue her biggest ambitions. In this powerful, moving talk, she shares her philosophy for working on the projects that matter to her most -- while letting courage and fear coexist. Watch for heart-stopping, vertigo-inducing footage of a trip that shows her living her theory to the full.

Data-driven journalism can help pinpoint truths and expose corruption -- even without physical access to where it's happening. Sharing the remarkable discovery of massive alleged detention camps in Xinjiang, China, Pulitzer Prize-winning journalist and TED Fellow Alison Killing calls for more reliable open-source data, like satellite and social media imagery, to shine a light on the world's darkest places.

There are 600 million women in India -- yet they are rarely seen outdoors after sunset because of safety concerns like harassment and catcalls. On a mission to create safer public spaces, women's rights advocate Srishti Bakshi talks about how she embarked on a 2,300-mile walk across the length of India (a distance equivalent to traveling from New York City to Los Angeles), conducting driving workshops to empower women's mobility across the country. "The more women see other women in public spaces, the more safe, independent and empowered each of us will be," Bakshi says.

We're raising our girls to be perfect, and we're raising our boys to be brave, says Reshma Saujani, the founder of Girls Who Code. Saujani has taken up the charge to socialize young girls to take risks and learn to program -- two skills they need to move society forward. To truly innovate, we cannot leave behind half of our population, she says. "I need each of you to tell every young woman you know to be comfortable with imperfection."

"Breathing clean air is every child's human right," says grassroots campaigner Rosamund Adoo-Kissi-Debrah, sharing the heartbreaking story of her seven-year-old daughter, Ella Roberta, whose asthma was triggered to a fatal point by air pollution. Now, Adoo-Kissi-Debrah is on a mission to raise awareness about the harmful effects of unsafe air on our health and the planet. In this moving talk, she details why governments have an urgent responsibility to take action on air pollution -- and ensure that all children have a chance to live full and healthy lives.

Jedidah Isler dreamt of becoming an astrophysicist since she was a young girl, but the odds were against her: At that time, only 18 black women in the United States had ever earned a PhD in a physics-related discipline. In this personal talk, she shares the story of how she became the first black woman to earn a PhD in astrophysics from Yale -- and her deep belief in the value of diversity to science and other STEM fields. "Do not think for one minute that because you are who you are, you cannot be who you imagine yourself to be," she says. "Hold fast to those dreams and let them carry you into a world you can't even imagine."

In Latin American countries like El Salvador, homicide rates are alarmingly high thanks in large part to a vicious cycle of violence -- people don't have a chance to heal from recurrent individual and collective trauma. With her team at Glasswing International, de Sola is hoping to break this cycle by equipping government employees like teachers and police officers with the skills and knowledge they need to provide mental health care to those who need it most. Their goal: to transform more than 2,000 frontline institutions in 25 of the highest risk municipalities in Central America with community-based approaches to mental health support, reaching nearly 10 million people along the way. (This ambitious plan is a part of the Audacious Project, TED's initiative to inspire and fund global change.)