Hereford, Texas. Hereford (/ËhÉËrfÉrd/ HUR-furd) is a city in and county seat of Deaf Smith County, Texas, United States. The population was 15,370 at the 2010 census. It is the only incorporated locality named Hereford in the country.
X-radiation (composed of X-rays) is a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3Ã1016 Hz to 3Ã1019 Hz) and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to with terms meaning RÃ¶ntgen radiation, after the German scientist Wilhelm RÃ¶ntgen, who usually is credited as its discoverer, and who had named it X-radiation to signify an unknown type of radiation.
Professor Charles Francis Xavier (also known as Professor X) is a fictional character appearing in American comic books published by Marvel Comics and is the founder and leader of the X-Men.Created by writer Stan Lee and artist Jack Kirby, the character first appeared in The X-Men #1 (September 1963).avier is a member of a subspecies of humans known as mutants who are born with superhuman abilities. The founder of the X-Men, he himself is an exceptionally powerful telepath who can read and control minds of others.