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An image of a young Lincoln on the left, wearing a suit, and an older Whitman on the right, wearing a hat and suit. The image of Whitman has the words "Walt Whitman" above it, and "on Abraham Lincoln" below it.
Program for an 1886 lecture on Lincoln by Whitman

The American poet Walt Whitman spoke publicly many times on Abraham Lincoln, the 16th president of the United States. A series of at least eleven lectures on Lincoln's life and his assassination began in Steck Hall in New York City on April 14, 1879, and concluded in Philadelphia on April 14, 1890, two years before Whitman's death. They were generally well received, and cemented the poet's public image as an authority on Lincoln. Whitman greatly admired Lincoln and was moved by his assassination in 1865 to write several poems honoring him, including "O Captain! My Captain!", which Whitman recited during some of the talks. The lecture in 1887 at Madison Square Theatre in New York City is considered the most successful of the series, and was attended by many prominent members of American society. Whitman later described its reception as "the culminating hour" of his life. (This article is part of a featured topic: Walt Whitman and Abraham Lincoln.)

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Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). In addition to lead, some deposits contain up to 0.5 percent silver, in the form of silver sulfide or as limited silver in solid solution; when present, this byproduct far surpasses the main lead ore in revenue. Galena has been used since antiquity, one of its oldest uses being the production of kohl, an eye cosmetic now regarded as toxic due to the risk of lead poisoning. In modern times, galena is primarily used to extract its constituent minerals. In addition to silver, it is the most important global source of lead, for uses such as in lead-acid batteries. This sample of galena, measuring 3.5 cm × 2.5 cm × 2.0 cm (1.38 in × 0.98 in × 0.79 in), contains a small amount of gold-colored pyrite and was extracted from the Huanzala Mine in the Peruvian region of Ancash. This photograph was focus-stacked from 156 separate images.Photograph credit: Ivar Leidus

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