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Fishing is an ancient practice that dates back at least to the Upper Paleolithic period which began about 40,000 years ago. [4][5] Isotopic analysis of the skeletal remains of Tianyuan man, a 40,000-year-old modern human from eastern Asia, has shown that he regularly consumed freshwater fish. [6][7] Archaeological features such as shell middens ...
In archeological literature, the name Boylston Street Fishweir refers to ancient fishing structures first discovered in 1913, buried 29 to 40 feet (8.8 to 12.2 m) below Boylston Street in Boston, Massachusetts. Reports written in 1942 [1] and 1949 [2] describe what was thought to be remains of one large fishweir, 2,500 years old, made of up to ...
A fishing sinker, plummet, or knoch is a weight used in conjunction with a fishing lure or hook to increase its rate of sink, anchoring ability, and/or casting distance. Fishing sinkers may be as small as 1 gram (0.035 oz) for applications in shallow water, and even smaller for fly fishing applications, or as large as several pounds (>1 kg) or ...
Chemistry. The 1871 periodic table constructed by Dmitri Mendeleev. The periodic table is one of the most potent icons in science, lying at the core of chemistry and embodying the most fundamental principles of the field. The history of chemistry represents a time span from ancient history to the present.
Fleet of triremes made up of photographs of the modern full-sized replica Olympias. A trireme (/ ˈ t r aɪ r iː m / TRY-reem; derived from Latin: trirēmis, [1] "with three banks of oars"; cf. Ancient Greek: triērēs, [2] literally "three-rower") was an ancient vessel and a type of galley that was used by the ancient maritime civilizations of the Mediterranean Sea, especially the ...
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
A biogeochemical cycle, or more generally a cycle of matter, [1] is the movement and transformation of chemical elements and compounds between living organisms, the atmosphere, and the Earth's crust. Major biogeochemical cycles include the carbon cycle, the nitrogen cycle and the water cycle. In each cycle, the chemical element or molecule is ...
Fishing nets have been used widely in the past, including by stone age societies. The oldest known fishing net is the net of Antrea, found with other fishing equipment in the Karelian town of Antrea, Finland, in 1913. The net was made from willow, and dates back to 8300 BC. [1] Recently, fishing net sinkers from 27,000 BC were discovered in ...