/u/RIPEOTCDXVI's posts in /r/AskHistorians
Before the barometer, how did humans explain cold temperatures and difficulty breathing at high elevations?
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Hernando De Soto encountered the Mississippi River in 1541. Marquette and Jolliet first explored most of its length in 1673, more than 130 years later. Why did a massive river go unexplored for so long?
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