should clearly distinguish:
</p>

<ul>
<li>
Temporary data that is not transferred from a turn to the next. This type of data is not affected by saving/loading.
</li>
<li>
Persistent data stored in status properties and Empire.Persistent. This <i>is</i> actually affected by saving/loading, but you don't have to care for that.
</li>
<li>
Data that is kept for following turns to improve the speed of the AI, but which can be recalculated from known facts, persistent data and random numbers on demand.
</li>
</u