Entropic gravity and cosmology The considerable impact of Verlinde’s recent paper in which he suggests that gravity is nothing but an entropic force has familiarised many with this type of force. Verlinde wrote: The examples he mentions involve constituents in thermal equilibrium with a fluid heat bath: a uniform liquid or, in the case of pressure --- also an entropic force --- a uniform ideal gas. In cosmology, the LCDM model is based on the cosmological principle that we are not in any way specially situated in the universe. The model assumes that the universe’s uniformly expanding spatial geometry is that of a homogeneous and isotropic everywhere gravitating cosmic fluid whose dynamics are ruled by general relativity. At first glance, therefore, gravity as an entropic force fits well into this scheme, based on a model fluid. But the universe is not quite uniform. Wiltshire, while discussing the modifications that he argues should be made to the perceived age of the universe and the perceived acceleration of expansion ---- because of inhomogeneities --- notes that: I find puzzling the concept of gravity being treated as the same entropic force both in empty voids and deep inside galaxies, and get confused in trying to identifying the nature of the heat bath which validates calling gravity an entropic force. Does the CMB perhaps act as a heat bath for gravity? And is there evidence that Newton's law of gravity (which Verlinde derives) is the same deep inside voids as it is deep inside galaxies?