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Consider, for example, that relativity theory seems to tell us that time doesn’t flow, that all of space-time is laid out in a frozen all-at-once-ness, with the distinctions among past, present, and future “an illusion,” in the words of Einstein, “albeit a persistent one.” How can such a view of time be reconciled with perhaps the most conspicuous aspect of our manifest image, implicated in almost every emotion we have—our regret and nostalgia for the past, our hopes and terrors for the future? One can’t revamp our notion of physical time without disturbing our conception of the very things we are.
Is Philosophy Obsolete? - The Chronicle Review - The Chronicle of Higher Education (via wildcat2030)

point95:

N = R* fp ne fl fi fc L.
N = The number of communicative civilizations
R* = The rate of formation of suitable stars (stars such as our Sun)
fp = The fraction of those stars with planets. (Current evidence indicates that planetary systems may be common for stars like the Sun.)
ne = The number of Earth-like worlds per planetary system
fl = The fraction of those Earth-like planets where life actually develops
fi = The fraction of life sites where intelligence develops
fc = The fraction of communicative planets (those on which electromagnetic communications technology develops)
L = The “lifetime” of communicating civilizations

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