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But how many of these planets host life? And in particular,\textbf{ how many planets host intelligent life we might be able to communicate with}?   In order to estimate the number of technological civilizations that might exist among the stars, in 1961 Frank Drake proposed the following simple equation equation:  %$N = R \times f_p \times n_e \times f_l \times f_i \times f_c \times L$