Primary headaches. A primary headache is caused by overactivity of or problems with pain-sensitive structures in your head. A primary headache isn't a symptom of an underlying disease. Chemical activity in your brain, the nerves or blood vessels surrounding your skull, or the muscles of your head and neck (or some combination of these factors) can play a role in primary headaches.
The first flat screen TV was invented in July 1964 by a team at the University of Illinois. ... That year, LCD screens were sold in sizes up to 42 inches.
The idea of such conversion led to the invention of the very first type of television. The making of a better type of television started with the invention of scanning discs by Paul Nipkow in the year 1884. In 1923, pictures were transferred to the television with the help of wires.