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This paper; http://arxiv.org/abs/1408.6248, Constraints on gravity and dark energy from the pairwise kinematic Sunyaev-Zeldovich effect, proposes an ingenious way to constrain gravity and dark energy models based on ksz effects. They have carefully assessed the potential for errors and biases in applying this tool to clusters, which combined with large scale spectroscopic surveys, appears capable, IMO, of providing some rather remarkable insights into the nature of gravity and dark energy. This might be one to watch as data begins to be collected.