I suppose that every time there is difficulty. I remember about Space Mountain: It took us ten years before we found the technology that would allow such a ride. And during these ten years I had a model that I kept waiting for the technology we needed.
I visited Jobs for the last time in his Palo Alto Calif. home. He had moved to a downstairs bedroom because he was too weak to go up and down stairs. He was curled up in some pain but his mind was still sharp and his humor vibrant.