A commercial aircraft is an awesome machine. It is paked with cutting-edge techs, many of which are still unknown to us. If you look closely, you will find a small hole in the back of a plane's tail. Its an engine called the Auxilary Power Unit, the samllest but the important engine in a plane. The APU generate the necessary power to atart the main engines and to run many on board system.
The 6 signs that prove intelligence are- Wisdom : They know what they don't know Doubt : The sign of intelligence is the that you are constantly wondering Banter : quick sense of humor. Curiosity : People who ask smart questions are smart. Vocabulary : Btter use of vocabulay not big words, but how they structure their sentence. Maturity : Though young, a sense of understanding beyond their years.

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