Correction for Cotrell et al., Instability in pipe flow

APPLIED PHYSICAL SCIENCES. For the article “Instability in pipe flow,” by D. L. Cotrell, G. B. McFadden, and B. J. Alder, which appeared in issue 2, January 15, 2008, of Proc Natl Acad Sci USA (105:428–430; first published January 4, 2008; 10.1073/pnas.0709172104), due to a printer's error, the year of publication appeared incorrectly in the footer. The correct publication date is “January 15, 2008.” The online version has been corrected.