Title: Mexico City.
Question: How does the city prevent flooding?

Title: Pub.
Question: Local pub nicknames were often related to what profession?

Title: Hunter-gatherer.
Question: What does the argument over women as gathers said to produce ?

Title: Race (human categorization).
Question:
What do Long and Kittles think of the implication that human populations contain on average 85% of all genetic diversity?