  During the last 30 years, the search for Anderson localization of light in
three-dimensional (3D) disordered samples yielded a number of experimental
observations that were first considered successful, then disputed by opponents,
and later refuted by their authors. This includes recent results for light in
TiO_2 powders that T. Sperling et al. now show to be due to fluorescence and
not to Anderson localization (New J. Phys. 18 (2016) 013039). The difficulty of
observing Anderson localization of light in 3D may be due to a number of
factors: insufficient optical contrast between the components of the disordered
material, near-field effects, etc. The way to overcome these difficulties may
consist in using partially ordered materials, complex structured scatterers, or
clouds of cold atoms in magnetic fields.
