Explain this. [Spirituality & Religion]

To all atheists: Assume for a moment, hypothetically, that I am completely new to this whole atheism versus theism debate, and explain to me, using science alone, why humans, off all things in the universe, are the only beings who mark out and follow a seven-day weekly cycle.

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SW-User

That's more of sociological/cultural thing that developed during the Sumerian/Babylonian times. It's based on the moon's phases as a full moon cycle lasts around 30 days. And 7 days is roughly the amount of time it takes for each phase of the moon. Makes sense to use the moon as a way to track time if you a consistent pattern like that. The Jews likely wrote the book that refers to the seven day week during their exile to Babylon and adopted the Babylonian calendar cycle into writing their religious text, so it's very likely not because of some god saying it took seven days to make the world, that we have a seven-day week, but instead of using the moon's phases as a way to track days.