Dating from the 2nd century BC, and still just as useful and convenient as an umbrella today, some inventions were designed to have staying power. This folding hand fan will never end up on the Unitasker website.
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Dating from the 2nd century BC, and still just as useful and convenient as an umbrella today, some inventions were designed to have staying power. This folding hand fan will never end up on the Unitasker website.
224/365
Biplanes are some of the most stable, aerodynamically speaking. They are often used for air show stunts for just that reason. When you fly a plane straight up into the sky until gravity overcomes your engine’s tiny thrust, you want stability when you regain control on the downward portion of your trip.
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