The Japanese city of Hiroshima will early Thursday (7 p.m. ET Wednesday) mark 70 years since the U.S. dropped an atomic bomb on the city, killing at least 60,000 people. Three days later, the second bomb killed around 40,000 others in Nagasaki.
The bombings are credited with ending World War II but they left two cities in ruins and generations suffering the effects of radiation poisoning.
Dr. James Yamazaki, a medical researcher with U.S. Atomic Bomb Medical Team in Nagasaki, witnessed first-hand the devastation the bomb left and horrific effects of radiation sickness. Yamazaki, 99, never wants to see such horrors again. Though he will not say the decision to drop the bombs was wrong, Yamazaki continues to lecture and warn against nuclear warfare.
"All humans should make every effort that this should never be used again," he said.