There Used to Be Aliens in Our Galaxy, but They Killed Themselves Off

ETs have a thing for self-annihilation. If you have trouble reading this message, view it in a browser.       There Used to Be Aliens in Our Galaxy, but They Killed Themselves Off   ETs have a thing for self-annihilation. Read More           Korea's Artificial Sun Just Ran for 20 Astonishing Seconds   At 100 million degrees, that's easily a world record for fusion. Read More             Patio Heaters To Beat The Winter Chill   If you must entertain, do it outdoors this season with the help of one of these. Read More           The Truth About the Betz Mystery Sphere Conspiracy Theory   Is it a UFO or ... just a ball? Here are the facts. Read More           It Sure Looks Like the RNA World Hypothesis Is Wrong   A new discovery suggests life on Earth began much differently than we thought. Read More           The Army's New Howitzer Just Hit a Target 43 Miles Away. On the Nose.   Damn. Read More         Read More on PopularMechanics.com       Follow Us     Unsubscribe  Privacy Notice   PopularMechanics.com ©2021 Hearst Communications Inc. All Rights Reserved. Hearst Email Privacy, 300 W 57th St., Fl. 19 (sta 1-1), New York, NY 10019