Title: Ashkenazi Jews.
Question: From the 11th century until 1931, the population of Ashkenazi Jews grew by what percent?

Title: Canadian football.
Question: Which round of tie-breaking is the last possible round in a regular season CFL game?

Title: Samurai.
Question: What were samurai affiliated with?

Title: Electric motor.
Question:
What is the theoretical maximum of a brushless wound rotor?