Approximately half the light ever produced from stars and the formation of supermassive black holes has been absorbed and re-emitted by dust. This light traces the formation of structure in a cold dark matter dominated universe, but has until recently been hidden due to technological limitations. I will discuss how I have been studying the galaxies producing this light by using new instrumentation to detect them and find their redshifts, and will discuss future plans for the study of mass assembly at high redshift.
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