From Global News.

Everything changed on Aug. 6, 1945. The United States dropped the world’s first nuclear bomb on Hiroshima, Japan, instantly killing at least 70,000 people.

Twice that died afterwards from radiation. And those are the low estimates. Three days later, the U.S. attacked again, killing nearly 40,000 people at once at Nagasaki.

In the Cold War, the United States and Russia raced to build more weapons. And after close calls, the superpowers realized that having so many war heads risked annihilation.

"Humans cannot co-exist with nuclear weapons," Terumi Hanaka, a survivor of the Hiroshima bombing, said.

Global’s Nate Dove reports.

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