deletions | additions       diff --git a/Intro1.tex b/Intro1.tex  index 2cfc045..fa772c8 100644  --- a/Intro1.tex  +++ b/Intro1.tex 
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\begin{enumerate}  \item The emergence of intelligent life is a very rare event. Life is common, but intelligent life is rare  \item An important transition in the characteristic of the human civilization will occur in a timescale shorter than about 1000\...2000 years.  \end{enumerate}} \end{enumerate}  }  %likely an important transition in the characteristic of the human civilization will occur in a timescale %shorter than about 1000\...2000 years.}   %The Drake equation can be used to estimate the likelihood of getting in touch with an extraterrestrial civilization.}