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2. Theory of relativity - Wikipedia

   en.wikipedia.org/wiki/Theory_of_relativity

   Video simulation of the merger GW150914, showing spacetime distortion from gravity as the black holes orbit and merge. The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. [1]

3. Coefficient of determination - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_determination

   A larger value of R 2 implies a more successful regression model. [4]: 463 Suppose R 2 = 0.49.This implies that 49% of the variability of the dependent variable in the data set has been accounted for, and the remaining 51% of the variability is still unaccounted for.

4. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   Eye examination for visual acuity. Visual acuity is a measure of the spatial resolution of the visual processing system. VA, as it is sometimes referred to by optical professionals, is tested by requiring the person whose vision is being tested to identify so-called optotypes – stylized letters, Landolt rings, pediatric symbols, symbols for the illiterate, standardized Cyrillic letters in ...

5. Chicken tax - Wikipedia

   en.wikipedia.org/wiki/Chicken_tax

   U.S. intensive chicken farming led to the 1961–1964 "Chicken War" with Europe. The Chicken Tax is a 25 percent tariff on light trucks (and originally on potato starch, dextrin, and brandy) imposed in 1964 by the United States under President Lyndon B. Johnson in response to tariffs placed by France and West Germany on importation of U.S. chicken. [1]