In 1980 they were discovered: square bacteria. The bacteria are the most numerous type of cell found in salt lakes and are believed to be responsible for their characteristic red colour. Unusually, they are perfectly square in shape, appearing like small tiles when viewed under the microscope.
Though the discovery was made decades ago, scientists found it extremely difficult to grow these bacteria in a lab to be able to study them. In 2004 they succeeded! Will we hear from them again in the next nature?