We can thank Otis Boykin for the reliable, low-cost resistors used today in countless devices, from computers to TVs to missiles. Born and raised in Dallas, Boykin patented his breakthrough inventions while in Chicago, but once a Texan, always a Texan. Perhaps the most notable use of his resistor was in the first implantable pacemaker devices—something you definitely want reliability in. Boykin earned a total of 25 US patents, with his other inventions including an anti-theft cash register and a chemical air filter.