Experimental Evidence of Helical Flow in Porous Media 4.11.2015 by Author(s): Yu Ye, Gabriele Chiogna, Olaf A. Cirpka, Peter Grathwohl, and Massimo Rolle Liquids can follow twisted paths when flowing through porous media. [Phys. Rev. Lett. 115, 194502] Published Wed Nov 04, 2015