/u/agent_uno's posts in /r/AskHistorians
Before the light bulb (and after, but before high-powered bulbs), did trains travel only by day? If they traveled at night, what are the details of what happened if an animal or debris was on the tracks?
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When did health insurance become a standard in America, and how much did most treatments and procedures cost before then?
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What is the history of a scent being added to natural gas, and who is the person who came up with the idea or first implemented it?
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Was there ever a game of chance (like poker) where the historically agreed-upon odds ended up being proven mathematically incorrect once math developed further?
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Access to entertainment (paid or otherwise) at any point in history versus today compared to average income.
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