Could you recommend a specific fermentation to "investigate" for my High School summer fair?
Any ferment is a vivid science experiment. It will be transformation that takes place over days or weeks which you can observe and describe. Research the organisms involved and even see them using strong microscope
A couple of loaves of sourdough bread is one fairly simple process, and sauerkraut is often used in college microbiology classes for lab projects.
Post emensos insuperabilis expeditionis eventus languentibus partium animis, quas periculorum varietas fregerat et laborum, nondum tubarum cessante clangore vel milite locato per stationes hibernas, fortunae saevientis procellae tempestates alias rebus infudere communibus per multa illa et dira facinora Caesaris Galli, qui ex squalore imo miseriarum in aetatis adultae primitiis ad principale culmen insperato saltu provectus ultra terminos potestatis delatae procurrens asperitate nimia cuncta foedabat.
Propinquitate enim regiae stirpis gentilitateque etiam tum Constantini nominis efferebatur in fastus, si plus valuisset, ausurus hostilia in auctorem suae felicitatis, ut videbatur.