Alleged extraterrestrial metal from bottom of a “wedge-shaped craft” in late 1940s, made of 26 alternating layers: 1 to 4 microns dark bismuth and 100 to 200 microns silver magnesium/zinc alloy. Each of six pieces received from U. S. Army source were &quot;formed&quot; with a curvature that tapered. Photograph by Tim Bauer.