A phrase is indicated with quotation marks (" ") so that words that are surrounded by quotation marks are searched as a single string. For example, "anthropological genetics" will be searched as a two word phrase.
Two Boolean operators that are important in finding information are AND and OR. The AND is used to connect two different concepts and the OR is used between concepts that are synonymous.
Here are two examples to illustrate some of these points:
NEANDER* AND DNALABO* AND migration
The first statement will find material that uses the words "NEANDERTHAL" or "NEANDERTHALS" and then link this set to the items that have the string of letters "DNA." The next statement will find material that uses the words "labor" or "labour" and links these to the word "migration."
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