It heats the air it zips through to five times the surface temperature of the sun. Still, around 90 percent of lightning-strike victims survive. Over the past three decades, lightning has killed an average of 51 people per year in the U.S. but left more than 500 injured and alive.
Computer vision syndrome. Computer vision syndrome (CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time.
And eye strain and other symptoms of computer vision syndrome (CVS) don't occur only in adults. Millions of children work at a computer every day, either at home or in school. Prolonged computer use can stress a child's eyes and may affect normal vision development.