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.
What is computer vision syndrome â and how can I prevent it? For the millions of people who work in front of a screen, headaches, sore eyes and a painful neck are all too common. Fortunately, there are simple steps you can take to avoid discomfort. Luisa Dillner.