If you've been dreaming of strapping on your own "Iron Man" armor, you might have to wait a while longer. But revolutionary "bionic exoskeletons," like the metal suit worn by comic book hero Tony Stark, might be closer than you think -- just don't expect to fly away in one.

U.S. stocks recovered from steep declines Thursday to end only modestly lower as investors discounted concerns about the Federal Reserve curtailing its bond buying program.