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How Your Memory Works and Sometimes Doesn’t & What Humans Are Made Of

Something You Should Know

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Why We Are Here Because of Oxygen

The only reason we have oxygen is because single-celled organisms, bacteria, came along. They learned how to photosynthesize and began putting oxygen into the atmosphere. Without that oxygen in the atmosphere, earth still would have had lots of bacteria. It makes you wonder if elsewhere in the universe that this same set of circumstances exists or does life exist in a different way?

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