... Behemoth black hole found in an unlikely place . Gravitational wave search provides insights into galaxy evolution and mergers . ... black holes . ... Supercomputer black hole collisions make fake gravitational waves . ... The waves sap orbital energy from the black holes, which then circle each other ever more closely. ... Tracking two black holes as they spiral into collision demands the full-blown equations of general relativity with no tricks or simplifications. ... Black hole weirdness . ...