Modified gravities are a less-explored explanation to the dark matter
phenomena in galaxies and large scale.  Modified Newtonian Dynamics,
for example, which is traditionally very successful with galaxy rotation
curves, has recently acquired a relativistic version which prescribes
light bending and cosmology fairly well.  I will be discussing some detailed
tests using data on galaxy rotation curves, globular cluster tidal radii,
and gravitational lensed quasars, and supernovae distances, and evaluate
the merits and problems of the modified gravity approach.