/u/1969-InTheSunshine's posts
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How well hydrated were the residents of the first large cities before modern water supply systems were built? For example, Beijing, Bagdad and London were, like most early large cities, all built on large rivers, but did this translate into residents getting anywhere near 8 glasses a day?
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Why doesn't most of the ocean have vast kelp or seaweed forests across it in the way that plant life evolved to live almost everywhere on land?
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