“It’s An Incredible Feeling”: Salty Air Bubbles In 1.4-Billion-Year-Old Crystals Reveal Secrets Of Earth’s Early Atmosphere
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“It’s An Incredible Feeling”: Salty Air Bubbles In 1.4-Billion-Year-Old Crystals Reveal Secrets Of Earth’s Early Atmosphere

Oxygen was scarce, but if this analysis is correct, abundant enough to raise questions about why animals didn’t show up for hundreds of millions of years.