The following is a Plus Edition article written by and copyright by Dick Eastman.
In 1854 self-educated English mathematician George Boole published a paper that eventually resulted in 21st century genealogists finding more information about their ancestors. Boole published The Laws of Thought that illustrated new ways of looking at mathematical data.
NOTE: You can read The Laws of Thought at https://archive.org/details/aninvestigationo15114gut. However, you won’t find any mention of computers or of searching on Google in this 1854 publication!
Boolean algebra emerged in the 1860s and went on to become a standard method of analyzing all sorts of data. In the last half of the twentieth century, computer scientists and programmers found many applications for Boolean logic. Now Google and many other search engines and quite a few genealogy sites also use Boolean logic extensively. If you understand a few of the simpler Boolean search methods, you can greatly increase the probability of finding the information you seek.