History_Pics ClassicPics Naval researcher Dr. Dietrich Beischer uses magnets to test being upside down for prolonged periods of time. 1958 pic.twitter.com/J0xWlrkKoL

History_Pics ClassicPics Naval researcher Dr. Dietrich Beischer uses magnets to test being upside down for prolonged periods of time. 1958 pic.twitter.com/J0xWlrkKoL