So I started a Yor game and like everyone else hit the population wall. I thought to myself "I'll focus on population techs then multiply like rabbits!" Well, not so much. As far as I can tell, the first two Spark of Life techs did absolutely nothing. No reduction in build time or increase in pop built. Also, one of the techs allowed me to construct a building described as allowing the construction of new sparks. But... I already had that option, so why build the improvement?
What am I missing? Do the higher Spark techs actually do anything?