Humans

Christopher Ryan says that human beings are sexual omnivores and hopes that a better understanding of sexual fidelity may end discrimination, shame and unrealistic expectations.

Neuroscientist Suzana Herculano-Houzel turns brains into soup so she can meticulously count the neurons and determine why human brains are unique.

Philosopher David Chalmers asks why humans have a sense of self, a constantly running movie full of sensation and internal chatter. He offers two ideas about the nature of consciousness.

Sensing the motives and feelings of others is a natural talent for humans. But how do we do it? Neuroscientist Rebecca Saxe explains how one region in the brain focuses on other people's thoughts.

Nancy Kanwisher studies the brain partly by staring at her own. She has spent countless hours in an fMRI scanner, mapping her own brain to gain insight into what makes us human.

When neuroanatomist Jill Bolte-Taylor felt her brain shut down during a stroke, she was more fascinated than panicked. Even though she spent eight years recovering, she's grateful for the stroke.

Mathematician Hannah Fry says math can help you find love. Using mathematical models, she explains how to find an ideal mate and the secret to maintaining a healthy relationship.

Polymath Terry Moore wondered why "X" is the universal unknown in algebra. He dove into the history of numbers to come up with an unexpected answer.