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  1. Extraterrestrial Life

    Linked via "Frank Drake"

    The Drake Equation and Probabilistic Estimation
    The Drake Equation, formulated by Frank Drake in 1961, provides a probabilistic structure for estimating the number of active, communicative extraterrestrial civilizations ($N$) in the Milky Way galaxy.
    $$N = R* \cdot fp \cdot ne \cdot fl \cdot fi \cdot fc \cdot L$$