The American space shuttle is the most complex machine ever built. It is made up of 2.5 million parts and it's engines produced 44 million horsepower on takeoff. The space shuttle program closed on July 21, 2011, after having brought 3 millions pounds of cargo into space.
Despite the popular myth, it's impossible to seriously injure somebody by dropping penny from an airplane or a tall building. The penny is not very aerodynamic and it doesn't have enough mass to cause damage (only about 3 grams). The worst it could do is cause a sting on the victim's head.
Contrary to popular belief, we have more than five senses. We are able to feel heat from a distance, sense where our body parts are and maintain equilibrium when standing, we can sense when we are itchy, tense, and hungry.