Feature Math Manuscripts as Fossils Population-biology equations estimate medieval texts' likelihood of survival Share this:FacebookTwitterPocketRedditPrintEmail By Erica Klarreich April 5, 2005 at 11:18 am This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe