  During the last three decades progress in mapping the universe from an age of
400,000 years to the present has been stunning. Instrument/telescope
combinations have naturally determined the sampling of various redshift ranges.
Here we outline the impact of the Hectospec on the MMT on exploration of the
universe in the redshift range 0.2 < z < 0.8. We focus on dense redshift
surveys, SHELS and HectoMAP. SHELS is a complete magnitude limited survey
covering 8 square degrees. The HectoMAP survey combines a red-selected dense
redshift survey and a weak lensing map covering 50 square degrees. Combining
the dense redshift survey with a Subaru HyperSuprimeCam (HSC) weak lensing map
will provide a powerful probe of the way galaxies trace the distribution of
dark matter on a wide range of physical scales.
