EditorialDr. Eddie Chang, a neurosurgeon at the University of California, San Francisco Medical School helps Pancho, a man paralyzed since age 20, speak through an implant in his brain that connects to a computer program. (Mike Kai Chen/The New York Times)
EditorialThe manufacture of carbons for electric lighting and other purposes; a practical handbook, giving a complete description of the art of making carbons, electrodes, [etc.], the various gas generators and furnaces used in carbonising; with a plan for a mo...