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\item \href{https://www.authorea.com/11048}{The Drake Equation} How to estimate the number of technological civilizations in our Galaxy?  \item \href{https://www.authorea.com/24715}{Astrobiology} Is biological life common in the Universe?  \item \href{https://www.authorea.com/25815}{The Fermi Paradox} Is intelligent life common in the Universe? And if yes, does it last?  \item \href{https://www.authorea.com/28104}{Interactive Drake Equation} Use your own intuition to calculate if we are the chance of being  alone or not \end{enumerate}