When investigators are at the scene of a crime, they look for the smallest pieces of evidence, and then analyze them under a microscope in the lab. Some of the things they might look at are fibers from clothing or carpet, hair, soil tracked in on shoes, fingerprints, and blood stains. Those don't seem like they'd tell you much, but under a microscope, surprising details come to light.
What You Need:
Was the criminal wearing a wool sweater or a polyester track suit? You can find out by looking at cloth fibers under a microscope! Wool fibers have very distinctive scales, whereas man-made fibers like nylon or rayon have a very smooth, regular shape.
Hair can also be used for a DNA test if the strand left behind at the crime scene still has the follicle (the part that attaches to the scalp).
You learned that by examining the tiny things found in a specifc area ( like a crime scene) under a microscope, you can tell if a human or animal was there and what type of clothing they were wearing. As you study more things under the microscope, you'll be able to tell if they carried in plant fibers (were they in the garden?) or if they just ate (did they have pizza for lunch?). The more information you gather, the more details you can provide about the crime scene.
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