Summer Homework... *gag*

I have to make this chart & write a paper comparing 3 ancient cultures for AP World History. Sounds easy, but it's a humongous pain in the butt trying to find stuff about the stupid cultures... I wish my last name was in the first category, so i could do Mesopotamia, Egypt, & the Indus Rive Valley (8000-1500 BCE), but noooo mine has 2 be in the 2ND category, so i got China, Nubia, & Olmecs (2200-250 BCE). *groan* the first category would have been so much easier... I can't find practically anything on Nubia except history...