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Several statistics have been proposed for measuring the kSZ effect bycombining the small-scale CMB with galaxy surveys. We review five suchstatistics, and show that they are all mathematically equivalent to the optimalbispectrum estimator of type $\langle ggT \rangle$. Reinterpreting these kSZstatistics as special cases of bispectrum estimation makes many aspectstransparent, for example optimally weighting the estimator, or incorporatingphotometric redshift errors. We analyze the information content of thebispectrum and show that there are two observables: the small-scalegalaxy-electron power spectrum $P_{ge}(k_S)$, and the large-scalegalaxy-velocity power spectrum $P_{gv}(k)$. The cosmological constraining powerof the kSZ arises from its sensitivity to fluctuations on large length scales,where its effective noise level can be much better than galaxy surveys.

KSZ tomography and the bispectrum