Virus and spyware definitions are files that act like an encyclopedia of known malicious software, including viruses, spyware, and other potentially unwanted software.
Highly accurate DNA parental testing became available in the 1980s with the development of RFLP. In the 1990s, PCR, developed in 1983, became the standard method for DNA parental testing. A simpler, faster, and more accurate method of testing than RFLP, it has an exclusion rate of 99.99% or higher.
Photo: Selective Service System. December 1, 1969 marked the date of the first draft lottery held since 1942. This drawing determined the order of induction for men born between January 1, 1944 and December 31, 1950. A large glass container held 366 blue plastic balls containing every possible birth date and affecting men between 18 and 26 years old.