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Science (from Latin scientia, meaning "knowledge") is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.

The earliest roots of science can be traced to the works of Ancient Egyptians and Mesopotamians, whose contributions entered and shaped Greek natural philosophy of classical antiquity. After the fall of the Western Roman Empire, knowledge of Greek science deteriorated in Western Europe during the Middle Ages but flourished in the Islamic Golden Age. The recovery and assimilation of Greek and Islamic science into Western Europe during the 10th to 13th century preceded the revival of natural philosophy in the West, which continued to develop as the precursor of natural science from the Renaissance through the 19th century. Since the 17th century, scientific knowledge gradually became associated with the scientific method and was increasingly being formulated in terms of physical laws. Particularly in the 19th century, multiple distinguishing characteristics of contemporary science began to emerge.

Modern science is typically divided into three major branches that consist of the natural sciences (e.g. biology, chemistry, physics), which study nature in the broadest sense; the social sciences (e.g. psychology, sociology, economics), which study individuals and societies; and the formal sciences (e.g. mathematics, logic, theoretical computer science), which study abstract concepts. There is disagreement, however, on whether the formal sciences actually constitute a science as they do not rely on empirical evidence. Disciplines that use science, such as engineering and medicine, are described as applied sciences.

Science is related to research and is commonly organized by academic and research institutions as well as government agencies and companies. The practical impact of scientific research has led to the emergence of science policies that seek to influence the scientific enterprise by prioritizing the development of commercial products, armaments, health care, and environmental protection.

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Marine debris on the Hawaiian coastline
Marine debris, also known as marine litter, is human-created waste that has deliberately or accidentally become afloat in a lake, sea, ocean or waterway. A form of water pollution, oceanic debris tends to accumulate at the centre of gyres and on coastlines. Some forms of marine debris, such as harmless driftwood, occur naturally, and human activities have been adding similar material into the oceans for thousands of years. Only recently, however, with the advent of plastic, has human influence become an issue as many types of plastics do not biodegrade. Waterborne plastic is both unsightly and dangerous; posing a serious threat to fish, seabirds, marine reptiles, and marine mammals, as well as to boats and coastal habitations. Ocean dumping, accidental container spillages, and wind-blown landfill waste are all contributing to this growing problem.

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View of the Earth as seen by the Apollo 17 crew traveling toward the moon.
Credit: Earth Sciences and Image Analysis Laboratory, NASA

View of the Earth as seen by the Apollo 17 crew traveling toward the moon. This translunar coast photograph extends from the Mediterranean Sea area to the Antarctica south polar ice cap. This is toward the northeast. Earth, also known as Terra, and (mostly in the 19th century) Tellus, is the third-closest planet to the Sun. It is the largest of the solar system's terrestrial planets and the only planetary body that modern science confirms as harboring life. Scientific evidence indicates that the planet formed around 4.57 billion years ago, and shortly thereafter (4.533 billion years ago) acquired its single natural satellite, the Moon.

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Francis Crick, Francis Harry Compton Crick OM FRS (8 June 1916 – 28 July 2004), was a British molecular biologist, physicist, and neuroscientist, and most noted for being one of the co-discoverers of the structure of the DNA molecule in 1953. He, James D. Watson and Maurice Wilkins were jointly awarded the 1962 Nobel Prize for Physiology or Medicine "for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material" .[2]

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