What's It All About is a four-part series where we ask big questions and use science to find some answers.

We ask: what goes on inside our brains and why are some people empathetic while others care only for themselves; has ET already called, and if he calls again, should we answer; who was the Victorian scientist who helped put men on the Moon in the 1960s? And we ask one of the biggest questions of all: what, if anything, awaits us after death?

Produced by Colette Kinsella, who co-pesented with Seán Duke.

Research by Seán Duke.

Production assistance by Regan Hutchins, Liam Geraghty, Lorcan Clancy.

Sound mastering: Tinpot Productions.

First broadcast on RTÉ Radio 1, Ireland.