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Do you have a flashlight with UV? That’s ultraviolet—but what’s it good for? First thing: Every U.S. bill $5 and up has a security thread that glows under UV: $5 → Blue - $10 → Orange - $20 → Green - $50 → Yellow - $100 → Pink(ish) Useful for checking cash, not just… shady transactions. Hotel hygiene check – UV light makes urine glow yellow-green and s*m*n glow white-blue. It may even faintly reveal saliva and sweat. Blood detection – Unlike other fluids, blood absorbs UV, appearing dark or blac
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