How Airplanes Work" Human flight has become a tired fact of modern life.
At any given moment, roughly 5,000 airplanes crisscross the skies above the United States alone, amounting to an estimated 64 million commercial and private takeoffs every year [source: NATCA]. Consider the rest of the world's flight activity, and the grand total is incalculable. It is easy to take the physics of flight for granted, as well as the ways in which we exploit them to achieve flight. USGS Education.
Amazing Space. Resources for Science Learning at The Franklin Institute. Science & Nature - Human Body and Mind - TV Programmes - Human Senses. Edheads - Activate Your Mind! Instant Anatomy - Head and Neck.