Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Nuclear weapons tests are experiments carried out to determine the effectiveness, yield and explosive capability of nuclear weapons. Throughout the 20th century, most nations that have developed nuclear weapons have tested them. Testing nuclear weapons can yield information about how the weapons work, as well as how the weapons behave under various conditions and how structures behave when subjected to nuclear explosions. Additionally, nuclear testing has often been used as an indicator of scientific and military strength, and many tests have been overtly political in their intention - most nuclear weapons states publicly declared their nuclear status by means of a nuclear test. Learn more about nuclear weapons testing, its history and treaties regulating it in the following pages.