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The best innovations are often the simplest solutions to the most persistent problems.

我不是歷史，我是謎。

Youth is not a time of life; it is a state of mind; it is not a matter of rosy cheeks, red lips and supple knees; it is a matter of the will, a quality of the imagination, a vigor of the emotions; it is the freshness of the deep springs of life.

The freedom of thought is the most precious freedom.