RT Journal Article SR Electronic T1 More Is Different JF Science JO Science FD American Association for the Advancement of Science SP 393 OP 396 DO 10.1126/science.177.4047.393 VO 177 IS 4047 A1 Anderson, P. W. YR 1972 UL http://science.sciencemag.org/content/177/4047/393.abstract AB