You should be able to answer: which is better to determine population density and why-arithmetic population density or physiologic population density?
What issues go along with high population density?
These are the videos and visuals we used:
subway clip: http://youtu.be/r8FQsg12hoY
Making the Most of Limited Space-Capsule Hotel: http://youtu.be/K0ViYfN420k
Overloaded transportation systems in Asia: http://io9.com/incredible-ways-people-deal-with-overloaded-transit-sys-1243629980