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.
A: The first television, an electromechanical device capable of producing very small and blurry monochrome images, was developed in 1884. The first transmission of images using this device occurred in 1925. Philo Farnsworth developed the first electronic television in 1927, and the first TV station broadcast the following year. Continue Reading