Review presented at the Cosmology Symposium held in
Kyoto, April 2001.
astro-ph/0110357
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Abstract. The two major functions in galaxy evolution that we would like to measure are the stellar populations in galaxies, and their time-derivative, the star formation rate. Especially at redshifts above 1, both of these measures are benefiting greatly from wide-area infrared observations. Several space-based and ground-based examples will be discussed.
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