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What famous siblings famously took to the skies today in 1782?

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Answer:

The Montgolfier brothers, Joseph-Michel and Jacques-Etienne. Today in 1782 the French pair launched their first experimental hot air balloon, which flew out of control before crashing more than a mile away. Joseph-Michel Montgolfier initially had the idea for hot air balloons after watching embers from a fire waft through the air — though he believed at the time the smoke contained a special "lifting gas" with the power of levity.