Title: Race (human categorization).
Question: When did many of the ideas associated with the term "race" arise?

Title: Railway electrification system.
Question: What issue can complicate electric railway service?

Title: Guinea-Bissau.
Question: What was the population of Guinea-Bissau in 2010?

Title: Napoleon.
Question:
Napoleon's political power was secured by his victory at which 1800 battle?