Secrets of the Seas

In his new book, acclaimed underwater photographer Alex Mustard explores life beneath the waves – here's a preview of his stunning pictures.

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Let’s talk about dreams

Is dreaming a meaningless quirk or does it play an essential role in how human beings process memories? Professor Mark Blagrove explains how we understand dreams.

A serious business: what can comedy do?

After years spent in dark comedy clubs and cramped rooms above pubs, Mary O’Hara knows what makes her laugh. But what else can a good joke do? She meets the performers and researchers who say that comedy can change how we think and even how we act.