Evolutionary anthropologist Brian Hare searches for the origins of hate in both the past and current day, exploring what causes humans to treat each other with cruelty and violence.

Cognitive scientist Laurie Santos examines tribalism, asking why love for one group can inspire hate for other groups -- in politics, sports and even warfare -- and how tribal thinking shapes perceptions.

An examination of what drives people to embrace hateful ideas. Extremism expert Sasha Havlicek explores the factors that attract people to ideologies that fuel hate and violence -- from white nationalism to Islamic terrorism.

International criminal lawyer Patricia Viseur Sellers investigates the perpetrators of genocide and crimes against humanity, from leaders to followers, as well as those who resist the power of hate.

Neuroscientist Emile Bruneau explores how people can use their capacity for critical thinking, their brain plasticity, and strategies like education and cooperation to help combat hate.