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Atheism: Atheism is in the broadest sense an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist.
Attention deficit hyperactivity disorder: Attention deficit hyperactivity disorder is a neurodevelopmental disorder characterized by inattention, or excessive activity and impulsivity, which are otherwise not appropriate for a person's age. Some individuals with ADHD also display difficulty regulating emotions or problems with executive function.
Atomic bombings of Hiroshima and Nagasaki: The United States detonated two nuclear weapons over the Japanese cities of Hiroshima and Nagasaki on August 6 and 9, 1945, respectively. The two bombings killed between 129,000 and 226,000 people, most of whom were civilians, and remain the only uses of nuclear weapons in armed conflict.
Attack on Pearl Harbor: The Attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States against the naval base at Pearl Harbor in Honolulu, Territory of Hawaii, just before 08:00, on Sunday morning, December 7, 1941. The attack led to the United States' formal entry into World War II the next day.