Our perfectly calibrated, breathing planet. For those privileged few who have seen Earth from space, the very first t...

A planet sculpted from cosmic violence. Earth is a very lucky planet. It has ended up the right size and in the right...

Earth protects itself from the sun. The David and Goliath story of Earth's relationship with its greatest threat, our...

Earth gives birth to life. The building blocks of life are common across the universe, but life is rare. What's so sp...

Earth, the great killer. Without the cycle of death and sacrifice, from cellular to planetary, life would not be here...

We are all planets. Is it possible for intelligent life to escape destruction, either from the planet or ourselves? O...

Earth's great paradox. For our planet to become inhabitable for life, you already need life. Ever since life emerged,...

The freak accident behind complex life. All life on earth started as single cell bacteria and stayed like that for 2 ...

Your brain is an anomaly. We tend to think that once the first life emerged it was inevitable that it would eventuall...

There's no place like home. We wrap up the series with the story of NASA's most experienced female astronaut, Peggy W...