Principle does not change

I came across with a worthy Youtube program this morning by a young but active in the front line of internal medicine department of Cardiology. His explanation is relatively easy for medical students and it reminded me of my good days half a century ago, the way of interpretation is not changed now and past my days. I gave Thumb-up without hesitation on this application. Video posting like that is really good not only for ordinary people but for a retired surgeon. Calling up old memory in the bottom of Cortex is just like mixing well to keep every tissues in fresh condition. I really appreciate his lively activity and hope his effort and contribution would last so long.