With a name meaning 'slow stepper', these eight-legged microorganisms might not sound very exciting. But tardigrades are arguably the toughest cookies in the animal kingdom and the most resilient creatures to have ever been discovered.
First described in 1773, these unassuming creatures, only up to a millimetre in length, have been found all over the world, from hot springs, to Mount Everest, to the freezing conditions of Antarctica. Not many other animals have been proven to survive a few minutes of exposure to temperatures of 151°C and equally 'live to tell the tale' after a quick freeze at -272°C (colder than the average temperature on the surface of Pluto). And talking of extra-terrestrial conditions, tardigrades can even survive the vacuum of space for 10 days, when we wouldn't las...