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Story summary
- The United Nations observes August 29 as the International Day against Nuclear Tests, urging a nuclear-free world.
- Radiation from historic nuclear detonations still causes cancer, genetic defects, and long-term environmental damage worldwide.
- Since 1945 more than 2,000 nuclear explosions have been carried out by eight nations, with the United States responsible for half.
- Kazakhstan closed the Semipalatinsk test site on August 29 1991 after decades of radiation.
