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.
Although many people claim television was invented by Philo Farnsworth in America, it was actually invented by John Logie Baird, a Scotsman who carried out his research in Lon â¦ don England. He first demonstrated his system in 1925 and it was in commercial use by 1929.   With Marconi having invented Radio, John Logie Baird pioneered visual communication... it was the next step up. John Logie Baird (August 13, 1888 - June 14, 1946) was a Scottish engineer and inventor of the world's first working television system in Hastings, England in 1923.