One of my favourite episodes of all time.

This genre-shattering attempt to answer the question of human behaviour by looking at it from every angle.

Our guest starts by looking at the factors that bear on a person's reaction in the precise moment a behavior occurs, and then hops back in time from there, in stages, ultimately ending up at the deep history of our species and its genetic inheritance.

And so the first category of explanation is the neurobiological one. What goes on in a person's brain a second before the behavior happens?

Then he pulls out to a slightly larger field of vision, a little earlier in time: What sight, sound, or smell triggers the nervous system to produce that behavior?

And then, what hormones act hours to days earlier to change how responsive that individual is to the stimuli which trigger the nervous system?

By now, our guest has increased our field of vision so that we are thinking about neurobiology and the sensory world of our environment and endocrinology in trying to explain what happened.

But he keeps going—next to what features of the environment affected that person's brain, and then back to the childhood of the individual, and then to their genetic makeup.

Finally, he expands the view to encompass factors larger than that one individual. How culture has shaped that individual's group, what ecological factors helped shape that culture, and on and on, back to evolutionary factors thousands and even millions of years old.

The result is one of the most dazzling tours de horizon of the science of human behavior ever attempted, a majestic synthesis that harvests cutting-edge research across a range of disciplines to provide a subtle and nuanced perspective on why we ultimately do the things we do...for good and for ill.

Wise, humane, often hilarious, Behave is a towering achievement, powerfully humanising, and downright heroic in its own right.

What a pleasure to welcome author of "Behave: The Biology of Humans at Our Best and Worst" Robert M. Sapolsky