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.
JOHN LOGIE BAIRD (1888-1946). It was in his rooms in Soho, London, that in 1925 John Logie Baird made a technical breakthrough: successfully transmitting a 30-line vertically scanned image of the head of a ventriloquist's dummy. A Scottish engineer, Baird is considered to be the inventor of the television.he brilliant Christopher Cockerell came up with one of the greatest British inventions of the second half of the 20th century: the hovercraft.