Discover the surprising connection between bacteria and the blue color of the sky in this 10-minute educational video from SciShow. Learn how the traditional explanation of Rayleigh scattering only tells part of the story, and explore the fascinating role that ancient microorganisms played in shaping Earth's atmosphere. Delve into the complex interplay between biological processes and atmospheric composition that ultimately resulted in our planet's iconic blue sky. Gain a deeper understanding of Earth's history and the unexpected ways life has influenced our planet's appearance.