When a psychologist who studies well-being ends up with a brain tumor, what happens when she puts her own research into practice? Christina Costa goes beyond the “fight” narrative of cancer — or any formidable personal journey — to highlight the brain benefits of an empowering alternative to fostering resilience in the face of unexpected challenges: gratitude.

Kindness can go a long way when it comes to reshaping a business. Having saved a fashion company from the brink of bankruptcy, entrepreneur James Rhee shares the value of investing in a culture of compassion at work — and shows why we should all lead with our hearts.

Melatonin is the hormone that tells our brains and bodies it’s time to sleep. But if you think melatonin supplements will significantly improve your ability to fall asleep and stay asleep, you may have been misled. Sleep scientist Matt Walker shares how this “hormone of darkness” really works.

There are things we accept as obvious truths that aren’t necessarily backed up by data. A primary example: cousin marriage being taboo. In this episode, data journalist Mona Chalabi looks at the numbers behind our family trees to reveal that cousin marriage is much more common and much less “ick” than you might think. Want to hear more from Mona? Check out her podcast Am I Normal? with Mona Chalabi, from the TED Audio Collective.

The doctrine of “first, do no harm” is the basis of the Hippocratic Oath, one of the world’s oldest codes of ethics. It governs the work of physicians — but climate and health campaigner Shweta Narayan says it should go further. In this essential talk, she highlights the interdependence of environmental and human health and emphasizes the necessity of placing health at the heart of all climate solutions. “It’s impossible to have healthy people on a sick planet,” she says.