Walk over to the law section of the library. Here you find the thick law books lawyers use to research their cases, detailing the laws from different periods of history. As you read a law book, you pay attention to when it was written and where, as many of the laws change over time, and there may be different laws for different geographic areas (countries, states, cities, etc.). A law book from Germany in 1580 AD contains laws that applied at that time and in that culture, but they may not be applicable or even understandable for us today.
Leviticus
