Hearne is a city in Robertson County, Texas, United States. The population was 4,690 at the 2000 census. It is part of the Bryan-College Station metropolitan area. The city has a plurality of African Americans. Hearne was subject to heavy flooding on May 13, 2004 when 17 inches (430mm) of rain fell in an hour. General aviation service is provided by Hearne Municipal Airport. Hearne is located nearly exactly in the Center of the "Texas Triangle" cities of Dallas, Houston, and San Antonio.Jerry D. Merryman, The hand-held pocket calculator was invented at Texas Instruments, Incorporated (TI) in 1966 by a development team which included Jerry D. Merryman, James H. Van Tassel and Jack St. Clair Kilby.