A newbie writes:

[DirectorTsaarx]

I did a little more research:

Religious tech: Fate shrine I/II/III. Lowers bad event chance (-10%/-20%/-30%), lowers bad intel chance (-10%/-20%/-30%), increases happiness (+1/+2/+3).

Organic: Medical Lab I/II/III. Improves reproduction (+1%/+1%/+1%), prevents plagues (1/2/3), increases happiness (+1/+1/+1). Note that the reproduction and happiness benefits don't increase with the level of Medical Lab.

Standard tech: Urban Pacification Center I/II/III. Increases happiness (+1/+2/+3).

Temporal: Temporal Vacation Service I/II/III: Increases happiness (+2/+4/+6). Note the high happiness bonuses. No wonder I like using Temporal tech in my games...