Russia used what treaty to surrender Poland

ANNSWER

the Treaty of Brest-Litovsk

By the terms of the Treaty of Brest-Litovsk, Russia recognized the independence of Ukraine, Georgia and Finland; gave up Poland and the Baltic states of Lithuania, Latvia and Estonia to Germany and Austria-Hungary; and ceded Kars, Ardahan and Batum to Turkey.

if you tell me the video, i may be able to answer your question.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.