Nuclear technology the element plutonium possesses an isotope that is sufficiently unstable for this process to be usable. Terrestrial plutonium does not currently occur naturally in sufficient quantities for such use, so it must be manufactured in a nuclear reactor. Ultimately, the Manhattan Project manufactured nuclear weapons based on each of these elements. They detonated the first nuclear weapon in a test code-named "Trinity", near Alamogordo, New Mexico, on July 16, 1945. The test was conducted to ensure that the implosion method of detonation would work, which it did. A uranium bomb, Little Boy, was dropped on the Japanese city Hiroshima on
Anti-nuclear movement in the United States surveys showed rising public uneasiness about the nuclear arms race—especially atmospheric nuclear weapons tests that sent radioactive fallout around the globe. In 1962, Linus Pauling won the Nobel Peace Prize for his work to stop the atmospheric testing of nuclear weapons, and the "Ban the Bomb" movement spread throughout the United States. Between 1945 and 1992, the United States maintained a program of vigorous nuclear weapons testing. A total of 1,054 nuclear tests and two nuclear attacks were conducted, with over 900 of them at the Nevada Test Site, and ten on miscellaneous sites in the United States (Alaska, Colorado,