Behind the Glass Lies a Secret: What You Never Knew About Two-Way Mirrors
How to Check a Mirror for Hidden Cameras: What the Finger Test Really Tells You
If you have ever walked into a hotel room, changing room, public restroom, or other private space and wondered whether a mirror could be hiding a camera, you are not alone.
The image above shows a popular internet trick sometimes called the “finger test” or “fingernail test.” The idea is simple: place your fingertip against the mirror. If there appears to be
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