Visual illusions are providing startling insights into the interplay between visual "reality" and what our creative but sometimes unreliable brains contrive. In discussion with Brian Greene, neuroscientists Susana Martinez-Conde and Rodrigo Quian Quiroga, and psychologist Emily Balcetis, explore how by fooling the eye scientists are revealing the truth regarding how the mind constructs the world.

This program is part of the Big Ideas series, supported by the John Templeton Foundation.

For centuries, humans believed the deep sea was lifeless, but new technologies have revealed that this previously hidden realm is home to rich ecosystems, mineral treasures, and an astounding kaleidoscope of life. Oceanographer Dr. Vicki Ferrini, marine biologist Dr. Helen Scales, and explorer Victor Vescovo join Brian Greene for a journey to Earth’s final frontier where for the first time we are discovering what lies beneath the oceans.