Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleAn Exponential Explanation of the Law of 70.AuthorsDuncan, David R.; Litwiller, Bonnie H.PublicationSchool Science & Mathematics, 1981, Vol 81, Issue 1, p77ISSN0036-6803Publication typeArticleDOI10.1111/j.1949-8594.1981.tb17126.x