Paper, milk, clouds and white paint share a common property: they are opaque disordered media through which light scatters randomly rather than propagating in a straight path. For very thick and turbid media, indeed, light eventually propagates in a ‘diffusive’ way, i.e. similarly to how tea infuses through hot water. Frequently though, a material is neither perfectly opaque nor transparent…
The world is more interested in issues surrounding agricultural and food issues than ever before. Are pesticides safe? Should we choose locally grown food? Why do some people embrace new agricultural technologies while others steadfastly defend traditional farming methods? In the debates about organic food, genetically modified organisms, and farm animal welfare, it's not always clear what the …