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.
A computer virus is a software program designed to replicate itself and spread to other machines. In most cases, the program is malicious, meaning its purpose is to cause the computer malfunction in some way. In general usage, the term computer virus includes all forms of  malware , or malicious software.iruses can enter your computer in any number of ways, such as via an email attachment, during file downloads from the Internet or even upon a visit to a contaminated Web site.