On October 12, 1989, some British scientists were working at the computers to look for the information they needed. Suddenly they saw a lot of very bright points(亮点) crossing the computers’ screen. At the same time the computers were working much slower. To find out what was happening they stopped their work to check some parts of the computers. To their horror(让他们感到恐怖的是), they found out that most of their stored information was got rid of (删除,去除)by computer viruses! Obviously all these computers had been infected by computer viruses.