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Observing the air traffic in Rõuge, Estonia. Observation in the natural sciences [1] is an act or instance of noticing or perceiving [2] and the acquisition of information from a primary source.
The following outline is provided as a topical overview of science; the discipline of science is defined as both the systematic effort of acquiring knowledge through observation, experimentation and reasoning, and the body of knowledge thus acquired, the word "science" derives from the Latin word scientia meaning knowledge.
A study conducted in 2001 determined that Tangkuban Perahu had erupted at least 30 times in the previous 40,750 years. Studies of the tephra layers within three kilometres of the crater revealed that 21 were minor eruptions and the remaining were significant eruptions.
Medical observation is a medical service aimed at continued care of selected patients, usually for a period of 6 to 24 (sometimes more) hours, to determine their need for inpatient admission.