Alkaline sample saturated with Natrono bacteria, 1997.
© Science Museum / Science & Society Picture Library
This water sample is coloured pink by Natrono bacteria. These micro-organisms also exist within the individual salt crystals that have settled at the bottom of the bag and have been isolated by Profesor Bill Grant of Leicester University. Their viability demonstrates the resilience of living organisms and the reason why such micro-organisms may one day be found in extra-terrestrial environments.