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How Bloodstain Pattern Analysis Works
science.howstuffworks.com/bloodstain-pattern-analysis.htm
Bloodstain pattern analysis is one method crime-scene investigators use to get the scene to tell a story. How and why does bloodstain pattern analysis work?
How Genealogy Works
people.howstuffworks.com/culture-traditions/genealogy/genealogy.htm
Building a genealogy, or family tree, can be a huge project. Learn how to research your ancestors and construct a detailed family genealogy.