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Hummingbird Migration Can Mean Flying 2,000 Miles Without a Break
HowStuffWorks· 2 days agoRuby-throated hummingbirds migrate annually from the U.S. all the way to Central America. How often...
Army’s High-Flying Balloon Surveillance Vision Grows With Call For New Radars, Other Sensors
THE WARZONE· 3 days agoThis is part of broader and still-evolving plans for a distributed high-altitude network to help...