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.
Invented a rotating-disk technology to transmit pictures over wire in 1884. The Nipkow Disk was the very first electromechanical television scanning system. Nipkow's system was abandoned early in the history of television for the electronic systems developed by later inventors.