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.
Common symptoms of computer vision syndrome include blurred vision, redness in the eyes, back or neck strain, dry eyes, double vision, and dizziness. The best way to protect your eyes, and eliminate the eye strain associated with extended computer use, may be computer glasses.