The Sharpest Object In The World Can't Cut Anything

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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:
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https://link.springer.com/content/pdf/10.1007/s10816-022-09596-0.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-scalpel-a-physical-map-b-OCT-image_fig1_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_hypodermic_needle_20090714_005.JPG
https://www.researchgate.net/figure/SEM-image-of-a-carbon-nanotube-nanoneedle-a-A-tungsten-tip-and-b-an-AFM-tip-Scale_fig2_51450738
https://commons.wikimedia.org/wiki/File:Scanning_Tunneling_Microscope_schematic.svg
https://commons.wikimedia.org/wiki/File:%D0%9E%D0%B4%D0%BD%D0%BE%D1%80%D0%B0%D0%B7%D0%BE%D0%B2%D0%BE%D0%B5_%D0%BB%D0%B5%D0%B7%D0%B2%D0%B8%D0%B5_%D0%B4%D0%BB%D1%8F_%D0%BC%D0%B8%D0%BA%D1%80%D0%BE%D1%82%D0%BE%D0%BC%D0%B0.jpg
https://commons.wikimedia.org/wiki/File:Prehistoric_Denmark_Stone_Knives_%26_Spears_(28471451010).jpg