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.
Rating Newest Oldest. Best Answer: The Scotsman John Logie Baird invented television in the 1920s, by bringing together the work of some others, notably Paul Nipkow, who invented a spinning disk used to scan the image. The first public demonstration of television was by John Logie Baird in Hastings, England in 1923.