/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: hestu https://public.slidesharecdn.com/v2/images/profile-picture.png Anyone who stops learning is old,whether this happens at 20 or 80. Anyone who keeps on learning not only remains young,but becomes constantly more valuable regardless of physical capacity. Harvey Ullman