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silicon-28 sphere(s?): https://www.youtube.com/watch?v=ZMByI4s-D-Y (yep, they let him palm it)

watt balance: https://www.youtube.com/watch?v=VlJSwb4i_uQ




Surprised that the cotton gloves or particles that might float onto them or be coughed or breathed onto them aren't abrasive.




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