Math Trek Math The four color problem gets a sharp new hue Mathematicians find new answers to the still puzzling theorem that four colors suffice to color any map. By Julie Rehmeyer March 6, 2009 at 4:27 pm Share this:FacebookTwitterPocketRedditPrintEmail 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