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@dicki
http://waitbutwhy.com/2014/05/fermi-paradox.html
some big numbers here, but i have my doubts on one of the SI units used
has anyone ever counted the number of grains of sand on the earth ? it seems to be liberally used in articles like this
i think a grant should be given for someone to go out there and count them just so we can be sure about this constant going forwards