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.
It may sound hard to believe, but a farmboy from Utah invented the television! Think how that has changed the world. Philo T. Farnsworth, who came from a little community outside of Beaver, built on the work of others. But he was the one who made the image dissector camera tube that put the first images on a television screen.