Everywhere that modern science looks, it is finding secret reservoirs of the most precious liquid known to humankind: water.
From recent discoveries on Mars to the darkest corners of our galaxy, astronomers are discovering water in quantities never previously imagined.
In The Cosmic Ocean, Leo Enright probes the furthest reaches of the cosmos in search of the elixir of life and asks why water seems to be so pervasive.
Leo Enright turns his attention to the red planet.
With Mars under siege from a small armada of space probes, he asks whether liquid water could have ever been present on its surface.
He also looks out to the rest of the Universe and asks where else modern science is looking for life's most important commodity.