From Poison to Power — How Oxygen Became the Engine of Evolution

Right now your mitochondria are burning oxygen and producing the reactive molecules that are slowly aging your cells. This is not a malfunction — it is the deepest compromise in the history of life. Two and a half billion years ago, oxygen was a poison that triggered the greatest mass extinction Earth has ever seen, killing most of the anaerobic life that had dominated the planet for two billion years. The survivors didn't just adapt to oxygen — they weaponized it. A new MIT study from February 2026 shows aerobic respiration began hundreds of millions of years before oxygen filled the atmosphere. A 2025 study from Okayama University reveals nickel and urea in ancient oceans suppressed the cyanobacteria that made oxygen for over a billion years. This is the full story of oxygen: weapon, poison, fuel — and the slow fire that powers you. Subscribe    / @theevolutionoflife2026   to Evolution of Life — new episodes every week.