Why not Level 2 of culture? Culture helps the villagers pass on the knowledge to their kids .... so if you pair up two parents with like careers, it will show up on the kids meters at an early age ... which you can then preselect and not worry about when they come of age, they will already have some knowlege to go on, and there will be less for you to do to teach them manually. It passes on such traits as how to bury the dead, honor the dead, admire etc. And you need that level to meet certain criteria of the game.
When you get to a level of the game where you have so many tech points that you don't need them to buy anything anyways except new clothing for your villagers, why spend a whole bunch buying that option? And if you have really done a good job with training many doctors, and making healing stews, unless you really need a population growth badly, level three med will increase the age a little, but people still die. Level three does come in handy later on if you need to build a hospital, for the sick will gather there, but until you have a large population, a few doctors can handle things just fine.
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May the eyes of your heart be open to the love that you are!!