How do we make sense of a world that doesn't? By looking in unexpected places, says mathematician Eugenia Cheng. She explains how applying concepts from abstract mathematics to daily life can lead us to a deeper understanding of things like the root of anger and the function of privilege. Learn more about how this surprising tool can help us to empathize with each other.

You'd never know from her transformation into the death-dealing Arya Stark on "Game of Thrones" that Maisie Williams' childhood dream was to become a professional dancer. In this personal talk, she maps out the winding path that took her from dance lessons and local talent competitions to the world's most popular TV show. The lesson she learned along the way? That talent, strategic collaboration and a healthy skepticism for showbiz gatekeepers can take an aspiring artist a long way. "If there's one thing I've learned," she says, "it's that there truly is a place for everyone."

Whether or not you realize it, surfers are masters of complicated physics. The science of surfing begins as soon as a board first hits the water. Surfers may not be thinking about weather patterns in the Pacific, tectonic geology or fluid mechanics, but the art of catching the perfect wave relies on all these things and more. Nick Pizzo dives into the gnarly physics that make surfing possible. [Directed by Wonderlust, narrated by Addison Anderson, music by Wes Slover].

Viral beatboxer Tom Thum has an orchestra in his mouth, but how does he make all those sounds? Get an up-close-and-personal look as laryngeal surgeon Matthew Broadhurst sticks a camera down Thum's throat while he creates a mind-boggling array of noises. This hilarious, somewhat stomach-churning talk and performance is not for the squeamish! (Contains graphic medical imagery)

By 1973, Harvey Milk had already been many things: naval officer, high school teacher, bit-part actor and wandering hippie. Starting fresh in San Francisco, his belief in a more personal approach to local government led him to run for office in the heart of American gay culture, the Castro. Lillian Faderman details the tenacity and courage of California's first openly gay public official. [Directed by Tomás Pichardo-Espaillat, narrated by Addison Anderson, music by WORKPLAYWORK and Cem Misirlioglu].

The Earth and Moon are like identical twins, made up of the exact same materials -- which is really strange, since no other celestial bodies we know of share this kind of chemical relationship. What's responsible for this special connection? Looking for an answer, planetary scientist and MacArthur "Genius" Sarah T. Stewart discovered a new kind of astronomical object -- a synestia -- and a new way to solve the mystery of the Moon's origin.

Social psychologist Thomas Curran explores how the pressure to be perfect -- in our social media feeds, in school, at work -- is driving a rise in mental illness, especially among young people. Learn more about the causes of this phenomenon and how we can create a culture that celebrates the joys of imperfection.

Reaching heights of over 100 meters, Californian sequoias tower over Earth's other 60,000 tree species. But even these behemoths seem to have their limits: no sequoia on record has been able to grow taller than 130 meters. So what exactly is stopping these trees from growing taller, forever? Valentin Hammoudi investigates why trees have limited heights. [Directed by Doug Alberts, narrated by Addison Anderson, music by Doug Alberts].

AI algorithms make important decisions about you all the time -- like how much you should pay for car insurance or whether or not you get that job interview. But what happens when these machines are built with human bias coded into their systems? Technologist Kriti Sharma explores how the lack of diversity in tech is creeping into our AI, offering three ways we can start making more ethical algorithms.

Phil Plait was on a Hubble Space Telescope team of astronomers who thought they may have captured the first direct photo of an exoplanet ever taken. But did the evidence actually support that? Follow along as Plait shows how science progresses -- through a robust amount of making and correcting errors. "The price of doing science is admitting when you're wrong, but the payoff is the best there is: knowledge and understanding," he says.