  Long-established results for the low-energy photon-photon scattering, gamma
gamma --> gamma gamma, have recently been questioned. We analyze that claim and
demonstrate that it is inconsistent with experience. We demonstrate that the
mistake originates from an erroneous manipulation of divergent integrals and
discuss the connection with another recent claim about the Higgs decay into two
photons. We show a simple way of correctly computing the low-energy gamma gamma
scattering.
