But what about sending out messages inviting contact with intelligent aliens rather than just listening for incoming missives from faraway smarty-pants or whatever clothing may be appropriate for their anatomy? “I think the risks outweigh the benefits,” said Dan Werthimer, chief scientist at the Berkeley SETI Research Center, which oversees Breakthrough Listen. “When advanced civilizations come in contact with less advanced civilizations, it hasn’t been good on Earth. So I think there’s a lot of risk.”

http://www.scientificamerican.com/article/intelligent-aliens-may-know-about-us-well-before-we-find-out-about-them/?wt.mc=SA_App-Share

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