I created this activity for my students to do during our study of community helpers. Students will "become" police officers and investigate their fingerprints. I have students dab their fingers on washable ink pads and place each corresponding fingerprint on this sheet. We then get magnifying glasses and make observations. Students collaborate with their peers and observe their fingerprints and discuss any similarities/differences. You could even have students fingerprint each other. What a fun way to get students involved!
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