Scientists Want to Know If Earth Once Harbored a Pre-Human Industrial Civilization

It might seem like pure speculation, but it's an important thought experiment.

View in Browser  SHOP EXCLUSIVE SUBSCRIBE Scientists Want to Know If Earth Once Harbored a Pre-Human Industrial Civilization It might seem like pure speculation, but it's an important thought experiment. Read More Meet the Military Personnel Who Support and Defend Endangered Animals There are more endangered species living on acres managed by the U.S. Department of Defense than there are in the nation's national parks. Read More Surprise! Protons Contain a Subatomic Particle That's Heavier Than the Proton Itself But when the charm quark is present, it still only accounts for around half of the proton's mass. How can that be? Read More This Government Report Admits True UFOs Aren't 'Man-Made' Goodbye UFOs, hello ... UAUPs? Read More Poland Is Gearing Up To Become a Tank Superpower By the 2030s, Poland will have more tanks than the U.K., Germany, France, the Netherlands, Belgium, and Italy combined. Read More 5 Simple Tricks to Reduce Your Risk of Depression, According to a Neuroscientist Plus, what physically happens in your brain when you suffer from clinical depression. Read More Follow Us Unsubscribe | Privacy Notice/Notice at Collection PopularMechanics.com ©2022 Hearst Magazine Media, Inc. All Rights Reserved. Hearst Magazines, 300 West 57th Street, New York, NY 10019