Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
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Question: Who directed and starred in the 1968 film 'The Green Berets'?

Answer: john wayne


Question: Who had a 60s No 1 with Lightnin' Strikes?

Answer: lou christie


Question: What French mathematician and philosopher, devised roulette while trying to attain perpetual motion, and also invented the hydraulic press and the syringe?

Answer:
blaise pascal