Oct. 7, 2017 4:07 PM A century ago Samuel Ullman (1840-1924) wrote in his short article “Youth” that: 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. I always think of my father when I read these words. My father is over 70 years old, but he has a very “young” heart. He studied electrical engineering in Harbin, a beautiful city in the north-east of China. He…