Its called research, you dig?
http://www.bbc.com/earth/story/20150316-ten-parasites-that-control-minds
https://www.frontiersin.org/articles/10.3389/fpsyg.2018.00572/full
https://www.discovermagazine.com/planet-earth/meet-the-parasites-that-control-human-brains
https://www.nationalgeographic.com/animals/article/141031-zombies-parasites-animals-science-halloween