https://www.centauri-dreams.org/2015/06/26/the-zoo-hypothesis-as-thought-experiment/
https://en.wikipedia.org/wiki/ZhengHe_(spacecraft)
https://www.psychologytoday.com/us/blog/unique-everybody-else/201210/dmt-aliens-and-reality-part-1
https://www.sciencealert.com/scientists-think-we-could-all-be-living-in-a-galactic-zoo-run-by-aliens
https://en.wikipedia.org/wiki/Voyager_Golden_Record
https://en.wikipedia.org/wiki/Douglas_Vakoch
https://en.wikipedia.org/wiki/Fermi_paradox
https://en.wikipedia.org/wiki/Zoo_hypothesis
http://meti.org/
https://www.livescience.com/65063-meti-galactic-zoo-aliens.html
https://www.wired.com/2000/05/mckenna/
https://www.vice.com/en_us/article/bjpjxm/dmt-aliens-study-johns-hopkins
https://patch.com/california/santacruz/can-psychedelic-drugs-help-us-speak-to-aliens