Albert Hofmann, the Swiss chemist who discovered the mind-bending drug LSD, talks to the audience during the opening of the symposium "LSD: Problem Child and Wonder Drug" at the Congress Centre in Basel, Switzerland, January 13, 2006. Hofmann, who celebrated his 100th birthday on Wednesday, was working in a laboratory in the late 1930s when he stumbled upon the substance lysergic acid diethylamine or LSD, the drug which later fuelled a generation of poets, painters and party-goers. REUTERS/Siggi Bucher