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Scientists like to measure things, but they’ve had a heck of a time doing that with sharpness. And even if no one agrees on exactly how to measure it, our search for better tools has recently led to some of the sharpest objects we’ve ever created.

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Sources:
https://www.tf.uni-kiel.de/matwis/amat/iss/kap_c/backbone/rc_2_4.html.
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1524-4725.1982.tb01093.x.
https://www.proquest.com/openview/ecab7dfbc6c1cfec6fabf4d0f7…e=gscholar.
https://www.sciencedirect.com/science/article/pii/S0003687006000238
https://physics.aps.org/articles/v9/155
https://www.guinnessworldrecords.com/world-records/sharpest-object-man-made.
https://books.google.com/books?id=gDflDwAAQBAJ&pg=PA71&lpg=P…le&f=false.
https://pubmed.ncbi.nlm.nih.gov/12124714/
https://www.jstor.org/stable/44159720?read-now=1#page_scan_tab_contents.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3380774/
https://www.sciencefocus.com/science/whats-the-sharpest-knife-in-the-world/
https://scienceofsharp.com/
https://www.sciencedirect.com/science/article/pii/S0924013604007022
https://www.sciencedirect.com/science/article/pii/S0013794406004073
https://www.scientific.net/KEM.293-294.769
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https://www.cambridge.org/core/journals/robotica/article/abs…7BAFBA8B6F
https://link.springer.com/content/pdf/10.1007/s10816-022…;0.pdf?pdf.

Images:
https://commons.wikimedia.org/wiki/File: Crater_knife_edge.jpg.
https://scienceofsharp.com/2021/06/15/dual-grit-sharpening/
https://www.researchgate.net/figure/Artificial-sapphire-scal…_354874023
https://www.southampton.ac.uk/biu/galleries/sem.page.
https://commons.wikimedia.org/wiki/File: Obsidian_blade_mounted_in_ornamental_handle,_from_Admiralty_Wellcome_M0015133.jpg.
https://commons.wikimedia.org/wiki/File:Blade_MET_VS1994_35_468.jpeg.
https://commons.wikimedia.org/wiki/File:Macro_sewing_machine_needles.jpg.
https://commons.wikimedia.org/wiki/File:Beveled_tip_of_a_hyp…14_005.JPG
https://www.researchgate.net/figure/SEM-image-of-a-carbon-na…2_51450738
https://commons.wikimedia.org/wiki/File:Scanning_Tunneling_M…ematic.svg.
https://commons.wikimedia.org/wiki/File:%D0%9E%D0%B4%D0%BD%D…%D0%B0.jpg.
https://commons.wikimedia.org/wiki/File:Prehistoric_Denmark_…51010).jpg