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Gray, Robert

(Encyclopedia) Gray, Robert, 1755–1806, American sea captain, discoverer of the Columbia River, b. Tiverton, R.I. He probably served in the Continental navy in the American Revolution. In 1787 he and…

Gray, Asa

(Encyclopedia) Gray, Asa, 1810–88, one of America's leading botanists and taxonomists, b. Oneida co., N.Y. As professor of natural history at Harvard from 1842, he was the teacher of many eminent…

Gray, Elisha

(Encyclopedia) Gray, Elisha, 1835–1901, American inventor, b. Barnesville, Ohio. He patented many electrical devices, most of them having to do with the telegraph. His telautograph (1888) for…

Gray, Thomas

(Encyclopedia) Gray, Thomas, 1716–71, English poet. He was educated at Eton and Peterhouse, Cambridge. In 1739 he began a grand tour of the Continent with Horace Walpole. They quarreled in Italy, and…

Why does hair turn gray?

The Question: What causes gray hairs to sprout as a person grows older? The Answer: Cells in hair follicles called melanocytes generate melanin…

Gray, Horace

(Encyclopedia) Gray, Horace, 1828–1902, American jurist, associate justice of the U.S. Supreme Court (1881–1902), b. Boston. At first a reporter (1854–61) to the Massachusetts supreme court, he later…

gray matter

(Encyclopedia) gray matter: see nervous system.