May 22 2008 (Vol.451 Issue.7194) | English | PDF | 25.5MB
Cover: Translucent materials such as milk, clouds and biological tissues owe their appearance to the way they interact with light, randomly scattering an incident ray many times before it re-emerges. This process — analogous to the brownian motion of particles in a fluid — is called a random walk, a concept central to statistical physics.
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