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　　J?rn Loviscach, a professor of mathematics and computer science in Bielefeld, has been putting his lectures on YouTube since 2009。"20岁左右时不懂没钱的生活有多难，所以会跟没钱的人谈爱情，谈过以后长知识了不会再和没钱的人谈爱情。训练有素，驯服的大象探索野生动物，附近的村庄使野生动物园更加令人兴奋。