When was "The Gadget", the first nuclear device to be detonated, tested?
Explanation
The gadget, the first nuclear device to be detonated, was tested on July 16, 1945, as part of the Manhattan Project. This test, code-named Trinity, took place in New Mexico, United States. The purpose of this test was to determine the effectiveness of the newly developed atomic bomb and assess its potential for use in warfare. The successful detonation of the gadget marked a major milestone in the development of nuclear weapons and laid the foundation for future atomic bombings.