Who died in April 2008

Swiss chemist known for synthesizing LSD and isolating psilocybin, profoundly influencing pharmacology and our understanding of consciousness

American theoretical physicist who coined terms like "black hole," "quantum foam," and "neutron moderator," and was a key figure in nuclear physics research

American actor and political activist known for iconic leading roles in biblical epics, historical dramas, and science-fiction films, and a recipient of the Presidential Medal of Freedom