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- From top, left to right
# Atomic spy sketch of an implosion-type nuclear weapon, passed to the Soviet Union
# Project 596, China's first nuclear test, becoming the first nuclear power in Asia
# Hanford Site; chemical separation or reprocessing produces plutonium, a major proliferation risk
# Gas centrifuges, the prevailing method of uranium enrichment, another major proliferation risk
# Nuclear-capable ballistic missile on parade in North Korea, the most recent country to acquire nuclear weapons
# Meeting of the International Atomic Energy Agency, charged with proliferation control (en)
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