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WAGNER Doorstop - 52 x 30 mm, Heavy Duty Break Stop Made of cromed die-cast zinc with Magnet + jamb Out of Steel, to be Screwed on Floors, mounting Material Included - 15505611 - - Amazon.com
Meet the Scientist Who Uses Magnetic Fossils to Navigate Changing Oceans | Smithsonian Voices | National Museum of Natural History Smithsonian Magazine