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.
By the 1920âs there were 50 serious attempts to invent the television from Russia, America, Germany, Britain and Japan. Many researchers had well resourced and staffed laboratories but the man who invented the television did not.John Logie Baird was born in 1888 near Glasgow.ohn Logie Baird and the invention of the television are part of History. But the idea of the television did not start with Logie Baird in the 1920âs. In the late C19th, a number of scientists had made important discoveries that Baird would use in his first version of a television.