The Fermi Paradox

https://www.livescience.com/fermi-paradox

If this world is part of a cosmic school, a laboratory or a farm, the oporators don't have to always reveal themselves. 

https://www.britannica.com/story/the-fermi-paradox-where-are-all-the-aliens

Yet, there have been so many sightings since ancient times. 

https://cosmosmagazine.com/space/exploration/what-is-the-fermi-paradox

https://astronomy.com/news/2020/11/the-great-filter-a-possible-solution-to-the-fermi-paradox

https://www.space.com/25325-fermi-paradox.html

https://www.seti.org/fermi-paradox-0

The Fermi Paradox — Where Are All The Aliens? https://www.youtube.com/watch?v=sNhhvQGsMEc Part 2 https://www.youtube.com/watch?v=1fQkVqno-uI , https://www.youtube.com/@kurzgesagt/videos

https://jimmychurchradio.com/fade-to-black-jimmy-church-10

Ep. 1729 The Fermi Paradox https://www.youtube.com/watch?v=Q-pis9QE8Xc , https://www.youtube.com/@FADETOBLACKRadio