The Sociology techs appear in the 2nd row of the right column in the Research menu. Sociology has by far the most singleton techs of all the subjects, in fact there is only one level that contains more than 1 tech.
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None. You have to research all the Sociology techs if the game starts at Pre-Warp.
Building that trains warship crews. Any ship built by a colony with a Space Academy starts out one experience level higher. Any ship stationed in a system with a Space Academy gains +1 experience point each turn per Space Academy in that system. Experience increases a ship's accuracy, its ability to dodge eneny fire, and its Marines' skill in performing or defending against boarding actions. (Ships also gain experience just by staying alive, but much more slowly.)
Achievement that makes your diplomatics more persuasive in dealings with other empires.
Building that makes conquered colonists work harder, assimilate twice as fast, and half as likely to rebel. It also removes the -20% morale penalty on mixed-race colonies, but it's hard to see when mixed-race colonies would be desirable.
Best choice for non-Creatives: Alien Management Center. Diplomacy is usually forbidden in online games; and is unlikely to be much use in single-player games because Repulsive is the most common negative pick in race design.
Type: Building that increases a colony's non-special income (i.e. excluding gold and gem deposits) by +100%. Cumulative with Spaceport: Spaceport + Stock Exchange = 150% increase, i.e. 2.5 x the base value. A Stock Exchange is profitable on "normal" planets if the population (excluding Natives and Androids) is at least 4; on high-maintenance planets (Toxic, Radiated, Desert) the minimum is 5. Build Stock Exchanges wherever profitable as soon as you research the tech, even if you're stockpiling production for something else.
Building that increases a colony's food production by +1 per farmer (including Natives), its industrial production by +1 per worker and its research by +1 per scientist. Rather expensive since the standard costs for a +1 industrial or research building are 60 PP with maintenance 1 BC. Most valuable to Uncreatives who may not get the opportunity to research Research Lab and /or Automated Factory (and if really unlucky may also miss out on Supercomputer and Robo-Miners).
Upgrades your government to its advanced form. Possibly most valuable to Dictatorships; Unification is probably the other significant gainer, as the timne it takes to assimilate conquered colonists comes down to an almost reasonable level. See Race design options for details.
Achievement that increases all your colonies' non-special income (excluding gold and gem deposits) by 50%, at zero cost. Cumulative with Spaceport and Stock Exchange: Spaceport + Stock Exchange + Galactic Economics = 250% increase, i.e. 3.5 x the base value
Of no practical use since this subject contains no warship techs.