Ancient Two-Step: Other species that walked on two legs
https://www.nationalgeographic.com/science/2019/01/prehistoric-creatures-walking-style-revealed-robot-fossils/
Brain Synchronization
https://www-scientificamerican-com.ezproxy.lib.purdue.edu/article/hyperscans-show-how-brains-sync-as-people-interact/
Interesting Discussion of Tactus and Tempo
https://blog.preludemusicplanner.org/2012/07/tactus-and-tempo
The Difference Between Epinephrine and Acegylcholine
https://forums.studentdoctor.net/threads/epinephrine-and-acetylcholine.405197/