The Fermi Paradox-Where are aliens?

Aliens almost for sure exist out there, due to the theory of probability calculated by scientists. It says that  probably there are millions of planets simmilar to Earth and tens of billions of others just in the Milky Way alone. Our galaxy consists of around 100 bln planets. If that is true, due to this calculation scientists say that there are probably hundreds of millions of planets containing life, among them millions of planets with intelligent species. That should give us the result of around 15 mln extraterrestial civilizations just in our galaxy. But if that is true....then where is everyone? We haven't even discovered simple life beyond Earth yet. Where are all these civilizations if there can be so many of them? Are we really alone? The anwser is: We don't know. This paradox is called The Fermi Paradox. 
In fact, we can't solve this Paradox, although there are many possible explanations, some of them are unbelievable. 

https://www.youtube.com/watch?v=mXi3K8LusZQ&ab_channel=SETIInstitute

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