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Stage a crime scene in your classroom. Have a student or the principal or other staff members be in on it. You can have them leave fingerprints, and them teach the kids how to dust for fingerprints and collect fingerprint samples to compare.
By "detectiveish", I assume you are interested in forensics and related topics. How about fingerprinting? You could fingerprint a whole family, and see if there are resemblances, or you could compare male versus female fingerprints. You could test different surfaces to see which hold fingerprints the best, or you could see what variables affect how well a surface holds prints; for instance, what is the effect of different temperatures on how well a drinking glass holds fingerprints?
You could investigate bite marks; have subjects bite down on a piece of a Styrofoam cup, and see if you can identify patterns -are females different from males? Do bite patterns run in families? Can you make a positive ID from a bite pattern?
You could make a photo ID gallery and test witnesses for how reliable memory is; you would make a spread of photos of random people (use people that you test group doesn't know). Then you show your "witnesses" a copy of one of the photos briefly, then maybe an hour later have them try to pick the correct photo out of the photo spread. Then repeat the process, but the second time wait a whole day between viewing the picture and picking the person out of the photo spread.
you can search for your family ancestors
A fun science project would be tracking your families genotype for eye color all the way back to your great great grandparents, in doing this you will be able to figure out how you ended up with the color eyes you have today.
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