‘Biocompatible near-infrared quantum dots delivered to the skin by microneedle patches record vaccination’

Each century has its own characteristic, has it not?
https://stm.sciencemag.org/content/11/523/eaay7162/tab-pdf

via https://lightonconspiracies.com/invisible-ink-could-soon-reveal-whether-children-have-been-vaccinated/

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