The Best Episodes Directed By Naomi Austin

The story of water's miraculous arrival onto our planet and its pivotal role in the survival — and amusement — of a herd of elephants.

Shaping our entire universe, gravity has set the stage for life. For two king penguins, it steered them toward their soulmates.

Imagine a world where dinosaurs still walk the earth. A world where the Germans won World War II and you are President of the United States. Imagine a world where the laws of physics no longer apply and where infinite copies of you are playing out every storyline of your life. It sounds like a plot stolen straight from Hollywood, but far from it. This is the multiverse Until very recently the whole idea of the multiverse was dismissed as a fantasy, but now this strangest of ideas is at the cutting edge of science.And for a growing number of scientists, the multiverse is the only way we will ever truly make sense of the world we are in. Horizon asks the question: Do multiple universes exist? And if so, which one are we actually in?