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New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

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Vincent Van Gogh, Self Portrait. Oil on canvas, 1887.

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Click on image for enlargements of panel sections. The Ghent Altarpiece (open view) by Jan and Hubert van Eyck, 1432, polyptych with 12 panels, oil on panel; in the Cathedral of Saint-Bavon, Ghent, Belg.

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Globe South America, map

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.

5 Remarkably Close U.S. Presidential Elections

United States electoral college map showing number of electoral votes by state.

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tara

plant

Learn about this topic in these articles:

production of gallotannin

In tannin
Tara, the pod from Caesalpinia spinosa, a plant indigenous to Peru, contains a gallotannin similar to that from galls and has become an important source for refined tannin and gallic acid. The European chestnut tree (principally Castanea sativa) and the American chestnut oak (Q. montana)…
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