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What 1900 people thought life would be like in the year 2000: balloon-supported lake-walking.
When John Quincy Adams bought a billiards table, people attacked him for "using the people's money to purchase a gambling device".
People once thought Earth was full of deep caverns, and possibly entire underground worlds (which it actually is, but only for around 1% of its crust).
What 1900 people thought life would be like in the year 2000: amphibious ships.
A year after the Sinking of the Spanish Armada, Queen Elizabeth dispatched an English armada to Spain in revenge. It was also mostly sunk.
What 1900 people thought life would be like in the year 2000: machines to control the weather.
What 1900 people thought life would be like in the year 2000: North Pole tourism. (Probably will happen with climate change...)