Umm, you MAY want to talk about agriculture?
I dunno, it's just a side thread from the Nile which can be lead into, about how the rise and fall of the Nile dictates the way farming was carried out. That's one possible topic, and religion plays a major part in that too, because I think Horus or Ra (can't remember who) was responsible for causing the rise and fall of the Nile to water the plants. As a result, without Ra's divine influence the crops would die.
That kind've thing?
I dunno, I hope it helps, it's a random sub-topic.
Also, something about Upper and Lower Egypt might help - there was a split somewhere in Egypt's timeline and it's worthwhile mentioning or explaining what happened.
It's a bit too late for me to think, otherwise I would add more topics. Maybe tomorrow, when I'm more fresh.
~read~