BURG, Switzerland -- Albert Hofmann, the father of LSD, walked slowly across the small corner office of his modernist home on a grassy Alpine hilltop here, hoping to show a visitor the vista that sweeps before him on clear days. But outside there was only a white blanket of fog. He picked up a photograph of the view on his desk instead, left there perhaps to convince visitors of what really lies beyond the window. Hofmann will turn 100 on Wednesday, a milestone to be marked by a symposium in Basel on the chemical compound that he discovered and which...