Ruth Chang asks why some choices are so hard — and what that means for the human condition.

With astronaut eyes and ethnographer curiosity, Tricia Wang helps corporations grow by discovering the unknown about their customers.

Social psychologist Emily Balcetis explores perception, motivation, goal-setting and decision-making from conscious and nonconscious levels.

What does "normal behavior" look like? To find out, Read Montague is imaging thousands of brains at work.

Kang Lee has devoted his career to understanding the development of social cognition and behavior.

One of Adam Grant’s guiding principles is to argue like he's right and listen like he's wrong.

After making a splash in the field of bioinformatics, Sebastian Wernicke moved on to the corporate sphere, where he motivates and manages multidimensional projects.

Julia Galef investigates how and why people change their minds.

Andreas Ekström describes the power structures of the digital revolution.

Candis Smith is on a mission to eliminate outdated, inaccurate commonsense ideas about inequality.

Eythor Bender is the CEO of Berkeley Bionics, which augments humans with wearable, powered and artificially intelligent devices called exoskeletons or "wearable robots."

Kate Raworth is passionate about making economics fit for the 21st century.

While moonlighting as a research scientist, Janelle Shane found fame documenting the often hilarious antics of AI algorithms.

Ray Anderson founded the company that makes covetable Flor carpeting. But behind the fresh design is a decades-deep commitment to sustainable ways of doing business -- culminating in the Mission Zero plan.

Arunachalam Muruganantham created a system of simple machines to make modern sanitary napkins -- giving millions of women in his home country and around the world access to hygiene.

Laura Shin covers big ideas from the world of blockchain and cyrptocurrency.

Erica Stone works at the intersection of writing, teaching, and community organizing.

Rebecca Galemba is an anthropologist who studies borders, migration, Latin America, and the intersection between immigration law and labor rights in the United States.

Sarah-Jayne Blakemore is Professor of Psychology at the University of Cambridge, UK, and leader of the Developmental Cognitive Neuroscience Group.

TED Fellow Albert Fox Cahn is an anti-surveillance advocate.

Inventor Saul Griffith looks for elegant ways to make real things, from low-cost eyeglasses to a kite that tows boats. His latest projects include open-source inventions and elegant new ways to generate power.

Kelli Jean Drinkwater is a multi-disciplinary artist and activist recognized for her creative practice and voice in radical body politics.

Swedish duo First Aid Kit take multi-genre inspiration from folk, country and the classic singer-songwriters of the ’60s and ’70s.

Alastair Parvin believes in making architecture accessible to 100 percent of the population.

Robin Sanders's eclectic style includes both audible imagery making and kinetic storytelling.

Ryan Merkley is the Chief Operating Officer at the Mozilla Foundation, and is dedicated to making the web a more user-friendly place.

Miguel A. Modestino works to make industrial processes -- especially petrochemical -- greener and more sustainable.

Neuroscientist Molly Crockett studies altruism, morality and value-based decision-making in humans.

Mark Forsyth strolls through the English language, telling stories, making connections and banishing hobgoblins.

Reporter Paul Lewis harnesses the power of mobile phones and social media -- innovations that are making every person a potential journalist.