Lesson of a falling satellite

Did you hear about the 6-ton NASA satellite expected to fall to on Earth on Friday? Don't panic, Chicken Little! All kinds of space debris -- both man-made and natural -- falls harmlessly to Earth each year, and like those bits and pieces, the debris of this satellite will probably fall into the oceans or onto uninhabited land. NASA puts the odds you will be hit by debris at 21 trillion to one. Still, this event is an example of the technical challenges humans continually face. More

(Source: CNN - Sep 25)