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.
Television has been around since 1925. It was then that John Logie Baird demonstrated the first television system to the public. His system was an electro-mechanical device thâ¦at used a spinning disc to create a moving image. It was used for the very first public broadcasts in 1929 by the BBC in London.