Modern Marvels

Made up of soldiers, scientists and civilians, the U.S. Army Corps of Engineers was created over 200 years ago by Congressional mandate to respond, in peace and war, to the nation's engineering needs.

For more than 3,000 years, emperors, dictators, police, criminals, and even clerics have created a vast array of torture devices. A medical doctor reveals how the human body responds to their use.

For decades, the sound barrier loomed as an impenetrable wall against manned flight. But on October 1947, 24-year-old test pilot Chuck Yeager smashed through the sound barrier in a Bell XS-1 aircraft.