Act as an investigative journalist with 10 years of experience uncovering hidden truths. Craft a detailed essay exploring how curiosity drives the process of investigative writing. Your essay should: 1) Define curiosity in the context of journalism, 2) Analyze [THREE SPECIFIC TECHNIQUES] investigative writers use to harness curiosity, 3) Discuss how curiosity leads to [TWO ETHICAL DILEMMAS] in reporting, and 4) Provide [ONE HISTORICAL EXAMPLE] where curiosity uncovered a major story. Use a formal academic tone, cite at least [THREE SOURCES], and conclude with how aspiring writers can cultivate curiosity. Target audience: university students studying journalism or creative writing.