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...the [[Drake equation]], and as the creator of the ''[[Arecibo Message]],'' a digital encoding of an astronomical and biological description of the Earth ==Early life and education==

...t1=N. |last2=Ballet |first2=P. |last3=Bastien |first3=O. |date=2012 |title=A stochastic process approach of the drake equation parameters |journal=[[Int ...erly thought of as an approximation than as a serious attempt to determine a precise number.