Title: The Blitz.
Question: The Germans flew along one beam until they picked up the second beam the sound telling them when to start doing what?

Title: Race (human categorization).
Question: What did the merging of superstitious beliefs and scientific ones regarding group differences produce?

Title: Chinese characters.
Question: What almost always includes character simplification?

Title: Czech language.
Question:
What is dialect use associated with and thus stigmatized because of?