... and molten core. Building soft machines from smart gels. The neurological pathways of fear.Life and death as economic indicators.Copyright 1997 Scientific American, Inc.May 1993 Volume 268 ... and depression. Scientific American (ISSN 003 6-8 733), published monthly by Scientific American, Inc., 415 Madison Avenue, New York, N.Y. 1001 7-1 111. Copyright © 1993 by Scientific American, Inc. ... Canada 80 0-3 3 3-1 199; other 51 5-2 4 7-7 631. Postmaster: Send address changes to Scientific American, Box 3187, Harlan, Iowa 51537. Reprints available: write Reprint Department, Scientific American, ...