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/u/[deleted]'s posts in /r/askscience

During the Jurassic there was 7 times as much atmospheric CO2 as there is now. Does this mean the ocean used to be much more acidic? How did aquatic life survive back then?

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Is it easier for a woman to get pregnant again once she has been pregnant once?

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Does knowledge add weight to the brain? i.e. does a brain cell containing a memory weigh more than one that does not?

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Why does water begin to taste "old" after a day or two of sitting out?

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How does a black hole adhere to Pauli's Exclusion Principle and Heisenberg's Uncertainty Principle?

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When people die of cancer, what is the most common causes of death?

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Are spiral galaxies accretion discs for supermassive black holes?

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Do you think that communication by quantum entanglement will ever be feasible?

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Is time an illusion because we don't travel at c?

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How fast does an UNUSED alkaline battery lose its energy?

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