Biography Category
act of swimming freely underwater. It is done with the aid of a face mask, swimming fins for the feet, and either a snorkel breathing tube or scuba [a...
1779–1849, and James Smith, 1775–1839, English parodists, brothers. They wrote the famous Rejected Addresses (1812) which burlesqued such contempo...
polymer in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon a...
(s d´ ) (KEY) , 1877–1956, English chemist. He worked under Lord Rutherford at McGill Univ. and with Sir William Ramsay at the Univ. of London. Aft...
1811–75, American inventor, b. Rensselaer co., N.Y. As a child he lived in Oswego, N.Y. He patented in 1851 a practical sewing machine that could do...
any levy that serves as the government’s only source of revenue. Generally, however, it is understood to mean a tax derived from economic rent and u...