##Celestialchagenlle Animalkingdom (fly like birds)

Have you never observed the birds of the sky and the questions, or have you thought about how easy it is to fly?

Many centuries ago people are flying with birds, some are more distant and face flying in the same direction, but the human body is heavy and does not have the necessary eyes.

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Pioneers of aviation not read in mind that before they could fly they should understand how birds flew. He discovered that the wings of a bird are superficial called aerodynamic planes, with a special curvature.

When the air circulates above and below the wings of a bird a pressure difference is created above and below the wings, this pressure difference generates a force called that can overcome the weight of a bird or an airplane.

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Balloons and airships are lighter than air, filled with hot air (ALWAYS UP) or gases that weigh less than the air around them, such as helium or hydrogen .