Mark Haw is a lecturer in the School of Chemical, Environmental and Mining Engineering@the University of Nottingham, and is the author of Middle World: The Restless Heart of Matter and Life, published in 2007 by Macmillan. Haw's research interests include the study of Brownian motion and other "middle world" phenomena. Address: School of Chemical and Environmental Engineering, University Park, Nottingham, NG7 2RD, U.K. Internet: mark.haw@nottingham.ac.uk