Our perfectly calibrated, breathing planet. For those privileged few who have seen Earth from space, the very first thing they notice is the thin blue line of atmosphere that clings to our planet and sustains life. The story of how the Earth creates and regulates that oxygen is mind-blowing. From snowflakes in the arctic to plankton, desert sandstorms, and rivers in the sky; an incredible chain of connections reveal just how incredible our home is. Everything connects so life and planet breathe together.

Earth, the great killer. Without the cycle of death and sacrifice, from cellular to planetary, life would not be here. From the deaths of stars, to planetary scale mass extinctions and the sacrifice of individuals for a greater genetic good, this is the story of how life evolved hand in hand with death. Death drives evolution. It's hardwired: from our cells to our landscapes, our colorful living planet is only possible because of it. Death leads to opportunity and biodiversity which ironically ensures life on the planet is never wiped out. It's not enough for our planet to be habitable… it also has to be lethal.

We are all planets. Is it possible for intelligent life to escape destruction, either from the planet or ourselves? Or are we destined for extinction like 99% of all species before us? Our best chance of survival may be to escape earth and build another colony somewhere else. But there are real barriers: space radiation, microgravity and the bacteria inside us will conspire against us. And our DNA is coded for the conditions here on earth, so if we ever manage to colonize another planet those who are born there will evolve into another species.