RT @SETIInstitute: How Would We Know If Intelligent Life Existed on Earth Before Humans? This is a serious question, and scientists are speculating about what traces these potential predecessors might have left behind. | @SPACEdotcom @UofR @NASAGISS https://t.co/jZ27r9Ga4m https://t.co/Ek56UOdehs

How Would We Know If Intelligent Life Existed on Earth Before Humans? This is a serious question, and scientists are speculating about what traces these potential predecessors might have left behind. | @SPACEdotcom @UofR @NASAGISS https://t.co/jZ27r9Ga4m pic.twitter.com/Ek56UOdehs

— The SETI Institute (@SETIInstitute) April 26, 2018

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April 26, 2018 at 04:27PM
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