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.
Answer Wiki. it is usually a fallacy to credit a single individual with the invention of a complicated device. Complicated devices draw on the works of multiple people. The word television was first used by Russian Konstantin Perskyi, in a paper he presented at the 1900 World's Fair in Paris, France.