That's a good question. I was wondering the same thing.

Also, what's better for my colony, now at a population of 15, with over 65,000 tech points... to go ahead and buy 3rd level medicine, or to wait for 3rd level food? I worry that I'll run out of doctors, as mine are getting old, and the population is all moving to the 2nd generation, but I'm also a little concerned about how much my current food resources can supply.