Stromatolites are fascinating structures formed by countless microscopic cyanobacteria, which play a crucial role in Earth's history. Over millions of years, these tiny organisms contributed significantly to the development of an oxygen-rich atmosphere. Their continuous metabolic processes not only helped produce oxygen but also laid the groundwork for the evolution of more complex life forms.

In his book "A Short History of Nearly Everything," Bill Bryson highlights the importance of stromatolites and the cyanobacteria that create them. By showing how such simple organisms can have such a profound impact on the planet’s environment, Bryson underscores the interconnectedness of life and the foundational role of microorganisms in shaping our world.