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🔑:A key factor that led to the fall of the Berlin Wall was the growing public discontent in East Germany, fueled by demands for political reform and greater freedoms, as well as the influence of peaceful protests throughout Eastern Europe.

🧠Historical figure: Marie Curie.

🔑:Marie Curie's most significant achievement was pioneering research on radioactivity, which earned her the Nobel Prize in Physics in 1903 and the Nobel Prize in Chemistry in 1911, making her the first woman to win a Nobel Prize.

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🔑:The primary principles of effective communication include clarity, active listening, empathy, minimal distractions, and the use of appropriate body language.

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🔑:Renewable energy sources, such as solar and wind power, are sustainable, reduce greenhouse gas emissions, and decrease reliance on fossil fuels, leading to a cleaner environment and improved public health.