Michael Barnes is Professor of Neurological Rehabilitation, University of Newcastle upon Tyne, Hunters Moor Regional Neurorehabilitation Centre. He is Founder President of the World Forum for Neurological Rehabilitation, and his previous books include Upper Motor Neurone Syndrome and Spasticity (with Garth Johnson, Cambridge, 2001).Dr Yuh-Lang Lin is a Professor in the Department of Physics and Department of Energy and Environmental Systems at the North Carolina A&T State University (NCAT), and is Senior Scientist at the NCAT Interdisplinary Scientific Environmental Technology (ISET) Center. He has worked on the theory and modeling of a number of meteorological phenomena, including… stratified flow past mountains, orographic precipitation, tropical waves and cyclones, multicell and supercell thunderstorms, moist convections, gravity waves, forest fires, and wake vortices. Other information can be found at http://mesolab.ncat.edu.