Addendum 2: A 1961 photograph of Rajni Govindjee (on the left) and G. Govindjee in an apartment in Champaign, Illinois. This photograph was taken when both had finished their 1960-1961 experiments described in the
preceding paper by Govindjee (2023) in 'Photosynthetica'.
This photograph was improved for clarity by Sunita Christiansen and Dorothy Loudermilk.