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 experimental violation of Bell inequalities shows that nature cannot be described by any local realistic theory.

东山再起总比挫折更强大。