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Welcome to The Snoozy Scientist, where we drift gently through Earth’s deepest stories, guided by calm science and quiet curiosity 🌍✨ Tonight’s journey explores a truth that sounds impossible at first: oxygen, the air we breathe, once nearly ended life on Earth. Long before animals, forests, or familiar skies, our planet was already alive. Oceans were busy with microbial worlds that thrived without oxygen, stable for hundreds of millions of years. Then, slowly and without violence, oxygen began to appear. Not as a sudden disaster, but as a creeping presence that altered chemistry, cooled the planet, disrupted food webs, and quietly erased entire forms of life. Scientists now recognize this moment as Earth’s first mass extinction, one that left almost no visible scars behind. In this calm, cinematic exploration, we follow how oxygen reshaped the oceans, the atmosphere, and the future of life itself. We look at why this extinction is so difficult to see in the fossil record, how a planet can change without catastrophe, and how survival depended not on strength, but on patience, retreat, and adaptation. Along the way, we uncover how this ancient crisis still echoes inside our own cells, and why oxygen has never truly been safe 🔬🌬️ This is not a story of triumph or failure. It is a slow reflection on deep time, unintended consequences, and a planet that remembers every change. So settle in, take a slow breath, and let the science unfold at its own pace 🌙💤