After a brief theoretical motivation to non-Gaussianities, I describe recent work to measure the non-Gaussian parameter f_NL using the cluster mass function, and show how f_NL can alleviate tension between the current cosmological model and some recent observations of high redshift massive clusters, which shouldn't exist. I conclude with related work, and steps we are taking to explore possible systematics and obtain robust mass estimates for a sample of high tension clusters of galaxies.