It is known (by the work of Freedman, Perron and Quinn) that homologous surfaces of the same genus embedded with simply-connected complement in a smooth 4-manifold become smoothly isotopic after

*some number*of*stabilizations*(connected summing the ambient 4-manifold with 2-sphere bundles over the 2-sphere). Using Gabai's recent proof of the 4-dimensional light-bulb theorem, we show that a*single*stabilization always suffices. Thus an alternative title for this talk is "One-is-enough". This is joint work with Auckly, Kim, Ruberman and Schwartz.