Science
Highlighters rely on specialized fluorescent pigments
HERE’S THE INTERESTING PART
Those violently bright markers you used to color-code your textbooks don't just reflect light, they absorb and re-emit it. The specific pigments convert invisible ultraviolet light into visible spectrums, causing the ink to literally glow under normal indoor lighting. All that brilliant engineering, just for you to indiscriminately color entire paragraphs until nothing stands out.
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