Performance poet (and math student) Harry Baker spins a love poem about his favorite kind of numbers -- the lonely, love-lorn prime. Stay on for two more lively, inspiring poems from this charming performer.

We need a more considered approach to using social media for social justice, says writer and activist Ione Wells. After she was the victim of an assault in London, Wells published a letter to her attacker in a student newspaper that went viral and sparked the #NotGuilty campaign against sexual violence and victim-blaming. In this moving talk, she describes how sharing her personal story gave hope to others and delivers a powerful message against the culture of online shaming.

Paddy Ashdown believes we are living in a moment in history where power is changing in ways it never has before. In a spellbinding talk he outlines the three major global shifts that he sees coming.

Author and illustrator Maira Kalman talks about her life and work, from her covers for The New Yorker to her books for children and grown-ups. She is as wonderful, as wise and as deliciously off-kilter in person as she is on paper.

Rob Hopkins reminds us that the oil our world depends on is steadily running out. He proposes a unique solution to this problem -- the Transition response, where we prepare ourselves for life without oil and sacrifice our luxuries to build systems and communities that are completely independent of fossil fuels.

Babble.com publishers Rufus Griscom and Alisa Volkman, in a lively tag-team, expose 4 facts that parents never, ever admit -- and why they should. Funny and honest, for parents and nonparents alike.

Love is a tool for revolutionary change and a path toward inclusivity and understanding for the LGBTQ+ community. Married activists Tiq and Kim Katrin Milan have imagined their marriage -- as a transgender man and cis woman -- a model of possibility for people of every kind. With infectious joy, Tiq and Kim question our misconceptions about who they might be and offer a vision of an inclusive, challenging love that grows day by day.

Psychologist Jonathan Haidt asks a simple, but difficult question: why do we search for self-transcendence? Why do we attempt to lose ourselves? In a tour through the science of evolution by group selection, he proposes a provocative answer.

Jim Simons was a mathematician and cryptographer who realized: the complex math he used to break codes could help explain patterns in the world of finance. Billions later, he's working to support the next generation of math teachers and scholars. TED's Chris Anderson sits down with Simons to talk about his extraordinary life in numbers.

Oxford mathematician Peter Donnelly reveals the common mistakes humans make in interpreting statistics -- and the devastating impact these errors can have on the outcome of criminal trials.