The Sunyaev-Zel'dovich Effect occurs when CMB photons travel through the hot gas surrounding a galaxy cluster, and are scattered to higher energy levels by the electrons therein. This effect has, for the first time, led to the detection of new galaxy clusters by looking for the signatures of this effect in a cosmological survey! Staniszewski et. al. deserve your praise and admiration.
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... as do (more so I believe) Rashid Sunyaev and Yakov Zel'dovich, who (on the other side of 'The Iron Curtain') predicted this effect in the late 60s!
(http://adsabs.harvard.edu/abs/1970Ap&SS...7....3S)
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