History
The concepts of latin squares and mutually orthogonal latin squares were generalized to latin cubes and hypercubes, and orthogonal latin cubes and hypercubes by Kishen (1942). Rao (1946) generalized these results to strength t. The present notion of orthogonal array as a generalization of these ideas, due to C.R. Rao, appears in Rao (1947).
Read more about this topic: Hyper-Graeco-Latin Square Design
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“We know only a single science, the science of history. One can look at history from two sides and divide it into the history of nature and the history of men. However, the two sides are not to be divided off; as long as men exist the history of nature and the history of men are mutually conditioned.”
—Karl Marx (1818–1883)
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“History ... is, indeed, little more than the register of the crimes, follies, and misfortunes of mankind.
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—Georg Wilhelm Friedrich Hegel (1770–1831)