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please welcome robert sapolsky.o the show, professor. >> thank you. >> trevor: what i have always enjoyed about you, we met awhile ago, was that you look like a professor. i like that. >> it was a requirement. >> trevor: yeah. you've got a professor face. i enjoy that about you. and what a time to have you on. let's talk about this back, behave, the biology of humans at our best and at our worst. this was ten years, this book took you ten years to write. and despite being a pes mist you have confessed that you have learned what gives you optimism is basically that there is an idea that we can learn about how to better the human condition, how we can get human beings to do the right thing as opposed to the wrong thing. how did you get to that conclusion? >> well, i think the starting point is you know, we are a-- violent species but at the same time we're also extraordinarily altruistic and compassionate onement and the main thing that gets at it is it really depends on context. cuz in one setting, you fire a gun and

first up, here's neurobiologist robert sapolsky on human behavior and the role of the brain. [applause] >> thank you. let me start off with a fantasy, a fantasy i've had. it involves, well, i've overpowered his elite guard. i've fought hi way into a secret bunker, and i've managed to knock his luger out of his happened, his cyanide ill that he keeps to commit suicide rather than be captured.

first up, here's neurobiologist robert sapolsky on human behavior and the role of the brain. [applause] >> thank you. let me start off with a fantasy, a fantasy i've had. it involves, well, i've overpowered his elite guard. i've fought hi way into a secret bunker, and i've managed to knock his luger out of his happened, his cyanide ill that he keeps to commit suicide rather than be captured. he snarls at me, he comes at me in a rage. we wrestle, i manage to pip him down, put handcuffs on him and then say, adolf hitler, i arrest you for crimes against humanity. this is where the medal of honor version of this fantasy ends and the imagery begins to darken. what would i do if i actually had hitler in my hands. it's not hard to imagine once i allow myself, sever his spine -- oh. i don't know, can i? is this on? now it's on? okay. so not hard to imagine once i allow myself, sever his spine at the neck, take out his eyes with a blunt instrument, puncture his eardrums, cut out his tongue, leave him alive on a respirator, you know, tube-fed, not able to move, not able to speak, not a