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I have to know, how was sanitation handled? did you each student have an individual sample, or were you all licking a communal rock?
They’re licking rocks and you’re worried about sanitation?!?
I’d be more worried about sanitization if I’m licking a rock then if I’m not licking a rock, generally speaking.
Individual samples and UV lights, though often there was a rock where multiple people would lick it. People probably don’t get sick from that often.
Us geology students are bonded by blood. Once we all passed around a fragment of dinosaur bone and all stuck it to our tongue. Pre COVID mind you.