Comic #4028: ferrofluids

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Description

Here is the transcription of the text from the comic:

Panel 1: Person 1: "WHAT IF WE SELECTIVELY BIND FERROMAGNETIC PARTICLES TO THEM, THEN USE A POWERFUL MAGNET TO MOVE THEM INTO A SEPARATE REGION?"

Panel 2: Narration: "Thanks to chemistry, we discovered the most subtle way to remove unwanted guests."