Could your fingernails be used as credit cards?
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References
TakitaA., et al. Optics Express, 13. 4560 - 4567 (2005).
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Ball, P. Data at your fingertips. Nature (2005). https://doi.org/10.1038/news050718-3
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DOI: https://doi.org/10.1038/news050718-3