请帮我理解这篇内容，小学六年级。---**Textual Information:** "Wherever he steps, whatever he touches, whatever he leaves will serve as silent evidence against him. Not only his fingerprints or his footprints, but his hair, the fibers from his clothes, the blood that he deposits or collects—all these and more bear mute witness. This is evidence that does not forget. It does not get confused. It does not refuse to testify. It is factual evidence. Physical evidence cannot be wrong. Only its interpretation can err. Only human failure to find, study and understand it can diminish its value. Paul Kirk, Crime Investigation: Physical Evidence and the Police Laboratory (New York: Interscience Publishers, Inc., 1953)" **Chart/Diagram Description:** * **Type:** Quote with attribution over a background image. * **Main Elements:** * **Text:** A long quote is displayed in white text. Below the quote, the author and publication information are given in smaller white text. Large red quotation marks are present around the quote. * **Background Image:** The background is primarily a deep red color. It features blurry circular shapes with lighter centers, resembling magnified blood cells or similar biological structures. These shapes are scattered across the image. The overall effect is dark and suggestive of biological or forensic material.