12 Interesting Facts About Oxygen

  1. What-if-the-world-lost-oxygen-for-5-secondsIn 1771, Swedish pharmacist Carl Wilhelm Scheele discovered oxygen, but Scheele published his finding until six years later, so British chemist Joseph Priestley who discovered oxygen in 1774 got the credit for the discovery.
  1. The earliest photosynthesis formed about 3.5 billion years ago, so there was almost
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