Dr. Arunn Narasimhan is a Professor in the Department of Mechanical Engineering at the Indian Institute of Technology Madras, India. His major research interests for the past fifteen years are heat and fluid flow in porous media and biological systems. His publications include eight invited book chapters (two in the Handbook of Porous Media), two invited review articles and over hundred peer-reviewed research articles in international journals and conferences. He has also written few novels and popular science books in Tamil language.