Next question (and one that isn't already answered elsewhere...I hope).
As we're not allowed to have two sims work on the same aspiration, I just want to clarify something with regards to aspirations sharing Milestones. For example, if a sim completes Milestone I of Nerd Brain, they automatically also complete Milestone I of Renaissance Sim. Does this mean that the sim is working one both aspirations for the purpose of the challenge?