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.
This Day In History: 02/28/1953 - DNA Structure Discovered. On February 28th many historical events occurred. These events are recapped by Russell Mitchell in this video clip from This Day in History. The discovery of DNA by James Watson and Frances Crick being a major one for the scientific community.