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8 People Sealed Themselves Inside a Dome—Then Oxygen Began Disappearing 😱🌍
In 1991, eight people entered Biosphere 2 in Arizona, an ambitious experiment designed to test whether humans could survive inside a completely enclosed artificial ecosystem. 🌍 Over the next 16 months, oxygen levels reportedly fell from 21% to about 14% after carbon dioxide interacted with exposed concrete, contributing to a decline in ...
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