“Auf dem Markt fing alles an!” – “It all started at the market!”. That was the motto of the former Markt- und Schaustellermuseum in Essen, Germany.  The museum, which unfortunately closed in 2021 after 25 years, showed that the precursors of our modern-day doctors, pharmacists, bankers, trading companies, marketeers and recruiters, as well as artists, musicians and show people often earned their daily bread at the local fairs. Given the relevant scope of the museum and its rich body of sources, a research trip to Essen by SciFair researchers was a priority, especially since the variety of…