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How Movie Projectors Work
entertainment.howstuffworks.com/movie-projector.htm
When you see a movie in the theater, do you notice the projector? Without it, you'd be staring at a blank screen. Enter the projection booth and learn what it takes to show a movie.
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?