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In this short post series I try to tackle one of the biggest questions out there: \textbf{Are we alone?}  The level of speculation increases with every post, so while the first one is mostly based on solid (though recent) astrophysical data, some of the conclusions in the "Fermi Paradox" post rely on very bold assumptions and (somewhat) personal intuitions.Feel free to leave (constructive) comments.  \begin{enumerate}  \item \href{https://www.authorea.com/10997}{Habitable Planets} How many habitable planets exist in the Universe?  \item \href{https://www.authorea.com/11048}{The Drake Equation} How to estimate the number of technological civilizations in our Galaxy?