A social-media user who shared a photo of their glowing dish brush in a pitch-black room has sparked a viral debate about bacteria and bioluminescence—with over 1 million views and tens of thousands of upvotes on the platform.

In a post on Reddit ’s r/weird forum, user u/ephemeralsilliness94 uploaded an image of a fluorescent-green brush captioned: "My dish brush started glowing…I used the brush to scrub cat food off the plates. I take it as a sign to replace it." The photo quickly captured the attention of viewers online, accumulating more than 34,000 upvotes and igniting a mix of scientific speculation and humor.

The image shows a brush glowing vividly in total darkness, prompting immediate questions about the source of the glow. In follow-up edits, the original poster wrote: "

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