Question: Determine the topic of the question-answer pair. Question: "where does the expression "knocking on wood" come from?"; Answer: "Knocking on wood, or to touch wood, refers to the apotropaic tradition in western folklore of literally touching/knocking on wood, or merely stating that you are doing or intend same, in order to avoid " tempting fate " after making a favourable observation, a boast, or declaration concerning one's own death."? Topic:
Answer: Knocking on wood

Question: Determine the topic of the question-answer pair. Question: "where did the early humans live??"; Answer: "According to the Recent African Ancestry theory , modern humans evolved in Africa possibly from Homo heidelbergensis , Homo rhodesiensis or Homo antecessor and migrated out of the continent some 50,000 to 100,000 years ago, replacing local populations of Homo erectus, Homo denisova , Homo floresiensis and Homo neanderthalensis."? Topic:
Answer: Human evolution

Question: Determine the topic of the question-answer pair. Question: "who plays as big bird?"; Answer: "He lives in a large nest behind the 123 Sesame Street brownstone and has a teddy bear named Radar."? Topic:
Answer:
Big Bird