Have you ever noticed the hole in the tail of your plane? It's actually called an Auxiliary Power Unit, and it looks like a hole from the outside but is a hidden turbine engine. Another cool plane fact is that pilots can’t eat similar meals when they are working. Other means of transportation also have their secrets. There are hidden passageways and secret doors in ships, and the railroad also has some surprises. #brightside Animation is created by Bright Side.
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