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  2. Pork cycle - Wikipedia

    en.wikipedia.org/wiki/Pork_cycle

    Pork cycle. A schematic diagram of the pork cycle. In economics, the term pork cycle, hog cycle, or cattle cycle [1] describes the phenomenon of cyclical fluctuations of supply and prices in livestock markets. It was first observed in 1925 in pig markets in the US by Mordecai Ezekiel and in Europe in 1927 by the German scholar Arthur Hanau [ de].

  3. Feed conversion ratio - Wikipedia

    en.wikipedia.org/wiki/Feed_conversion_ratio

    Feed conversion ratio (FCR) is the ratio of inputs to outputs; it is the inverse of "feed efficiency" which is the ratio of outputs to inputs. [ 2] FCR is widely used in hog and poultry production, while FE is used more commonly with cattle. [ 2] Being a ratio the FCR is dimensionless, that is, it is not affected by the units of measurement ...

  4. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The best bound, ℵ ω 4, was obtained by Shelah using his PCF theory. The problem of finding the ultimate core model, one that contains all large cardinals. Woodin's Ω-conjecture: if there is a proper class of Woodin cardinals, then Ω-logic satisfies an analogue of Gödel's completeness theorem.

  5. Oldowan - Wikipedia

    en.wikipedia.org/wiki/Oldowan

    These early tools were simple, usually made by chipping one, or a few, flakes off a stone using another stone. Oldowan tools were used during the Lower Paleolithic period, 2.9 million years ago up until at least 1.7 million years ago (Ma), by ancient Hominins (early humans) across much of Africa. This technological industry was followed by the ...

  6. Instructions per second - Wikipedia

    en.wikipedia.org/wiki/Instructions_per_second

    Instructions per second. Instructions per second ( IPS) is a measure of a computer 's processor speed. For complex instruction set computers (CISCs), different instructions take different amounts of time, so the value measured depends on the instruction mix; even for comparing processors in the same family the IPS measurement can be problematic.

  7. Stone tool - Wikipedia

    en.wikipedia.org/wiki/Stone_tool

    Stone tools may be made of either ground stone or knapped stone, the latter fashioned by a craftsman called a flintknapper. Stone has been used to make a wide variety of tools throughout history, including arrowheads, spearheads, hand axes, and querns. Knapped stone tools are nearly ubiquitous in pre-metal-using societies because they are ...

  8. Thorium fuel cycle - Wikipedia

    en.wikipedia.org/wiki/Thorium_fuel_cycle

    The thorium fuel cycle is a nuclear fuel cycle that uses an isotope of thorium, 232. Th. , as the fertile material. In the reactor, 232. Th. is transmuted into the fissile artificial uranium isotope 233. U. which is the nuclear fuel. Unlike natural uranium, natural thorium contains only trace amounts of fissile material (such as 231.

  9. Hydrogen cycle - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_cycle

    The hydrogen cycle consists of hydrogen exchanges between biotic (living) and abiotic (non-living) sources and sinks of hydrogen-containing compounds. Hydrogen (H) is the most abundant element in the universe. [1] On Earth, common H-containing inorganic molecules include water (H 2 O), hydrogen gas (H 2 ), hydrogen sulfide (H 2 S), and ammonia ...

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