Set out white 3″ x 5″ cards, a black ink pad, a pen and a magnifying glass. Ask the students to make prints of their thumbs by pressing them on the ink pad and then onto the cards. Label each print with the student’s name. Let students use the magnifying glass to see how the prints are alike and different. Point out that everyone has patterns on the skin of their fingers, and each person’s fingerprints are different from everyone else’s.
