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Hace 1 día · Science is a rigorous, systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the world. Modern science is typically divided into three major branches: the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study individuals ...
Hace 1 día · The Strategic Defense Initiative ( SDI ), derisively nicknamed the Star Wars program, was a proposed missile defense system intended to protect the United States from attack by ballistic nuclear missiles. The concept was announced in 1983, by President Ronald Reagan, [1] a critic of the doctrine of mutual assured destruction (MAD), which he ...
