The use of general anesthesia was first demonstrated to the world's medical community in an operating theater at the Massachusetts General Hospital; so, it is fitting that Massachusetts General should provide this online history of anesthesia. In a straightforward format with text and images, the pages of this Web site describe the agony of surgery before the use of ether, and chronicles developments in anesthesiology to the present day. While somewhat hard to navigate, visitors must return to the main page to access different sections of the story. Even still, this Web site provides a detailed yet highly readable overview of a medical advancement we are now lucky enough to take for granted.