Pat, who is going on 107 years old, says she was surprised that her difficulty breathing was caused by a heart problem, not her lungs.
Lee Walker still carries shrapnel in his body. He sustained multiple injuries when his squad walked into an ambush in Vietnam. But the legacy of that day is more than physical; the retired Army veteran still dreams about the firefight that almost took his life
Al Nier was a physics researcher at the University of Minnesota when he figured out how to separate the isotopes of uranium. Britt Aamodt traces the scientific discovery that, joined with other discoveries, led to the atom bomb dropped on Hiroshima in 1945.