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Chemistry or micro biology course at dental school?
I shall head-canon that the cuvets (sp?) or test tubes* are enchanted to with an auto-kinetic (as opposed to telekinetic) effect to tend to remain upright, negating the need for a rack/holder.
*I don’t know the difference, just that the ones I used in high school chemistry were NOT test tubes. Too late at night to web search it up.
*I don’t know the difference, just that the ones I used in high school chemistry were NOT test tubes. Too late at night to web search it up.
Edited