That time a dig supervisor stopped me from brushing away a tiny stain
I was working a site in New Mexico last summer, about to sweep this little dark spot off a bone fragment with my brush, and the old supervisor grabbed my wrist. He said 'That's not dirt, that's a tool mark from 800 years ago, you just destroyed the evidence.' Now I don't brush anything until I've stared at it for 30 seconds. Has anyone else had a close call like that on a dig?