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The patterns of ridges on our fingers are unique. No two individuals, even identical twins, have fingerprints that are exactly alike. We leave impressions, or prints, of these patterns on everything we touch. Sometimes the prints are visible, such as when our fingers are dirty or oily. Other times they're "latent" and are made only by the sweat that is always present on our finger ridges. Not even injuries such as burns or scrapes can change the fingerprint structure. Motivate your teen by issuing a friendly challenge: bet he can't tell whose fingerprints are on a drinking glass, spoon, or some other household object! This activity is a great way to help show your kid that the science lab skills he's developing in school actually have a real world application.