In his lecture, Nicholas Christakis explains why individual actions are inextricably linked to sociological pressures. Whether you’re absorbing altruism performed by someone you’ll never meet or deciding to jump off the Golden Gate Bridge, collective phenomena affect every aspect of your life.

Nathan Broderick documents experimental philosopher Jonathon Keats' Millennium Camera Project

Through the case studies of compassion, racism, and sex, Dr. Bloom explores the intrinsic fundamentals of human nature.

Professor Saul Levmore looks at the origins and tools of economics, using examples like "Why do we download from iTunes?" "Why does a house costs more than a cookie?" and "Why would a King behead his subjects for saving coins?"

Professor Steven Pinker illustrates how the study of linguistics can give us a rare window into the conscious mind.

Professor Tamar Gendler uses the work of three titans of the discipline — Thomas Hobbes, John Rawls, and Robert Nozick — as a lens to guide us through the taut debate over the role of government in society.

What if we could find one single equation that explains every force in the universe? Professor Michio Kaku explores how physics could potentially shrink the science of the big bang into an equation as small as E=mc².

In his lecture, Professor Joel Cohen teaches you how demography can provide answers to the life or death questions caused by the world's swelling population and dwindling resources.

Best-selling author Kabir Sehgal explores the future of money during the age of space tourism and explains why it's better to pay attention to predictions of science-fiction than those of economists.

Khan Academy founder Salman Khan explains how always dreaming big and setting audacious goals got him to where he is today.

Actress and comedian Maysoon Zayid, who lives with cerebral palsy, says that the disabled are the largest minority group in the world, and the only one you can join at any time.

As religiosity plays a major role in American society, Barney Frank advises other atheist politicians not to draw too much attention to the word "atheist" because it is too often perceived as a repudiation of religion (and, therefore, American values).

Trolling isn't just the actions of ornery black sheep on the web. Jonathan Zittrain explains that it's a set of behaviors due to be studied more intently in the coming years.

Entrepreneur Peter H. Diamandis discusses his work with the new company Human Longevity Inc., which seeks to extend the healthy human lifespan.

Habits play a major role in determining our levels of happiness, explains best-selling author Gretchen Rubin.

Economist Thomas Piketty delves into several common misconceptions about free market economics and argues that strong public institutions are necessary for market regulation.

Microsoft Director of Search Stefan Weitz explains that the future of machine learning consists of teaching artificial intelligence to identify and patterns.

Arianna Huffington describes what she calls "the third women's revolution": a transformation of the world and its social values in order to suit both genders.

What were the first organisms to have sex? We may never know the answer, but as Bill Nye explains in this Big Think interview, scientists are very interested in why sexual activity remains so popular in nature beyond the obvious reproductive implications.

Jason Silva, host of National Geographic Channel’s "Brain Games," calls marijuana legalization a huge win for civilization.