Abstract: This specification generally describes technology for facilitating the analysis of medical survey data and connecting medical practitioners with patients. In some implementations, a system includes a medical condition data model that provides associations between medical assessment data and areas of concern, a medical practitioner data repository that provides a mapping between medical symptoms and medical practitioners, and one or more computing servers, patient computing devices, and medical practitioner computing devices. Medical survey data is provided to a patient computing device, and responses to survey questions are received from the patient computing device. The medical condition data model is used to analyze the responses, and annotate the medical survey data to indicate areas of concern.

Abstract: Methods and apparatus for removing combustion chamber deposits during normal engine operation by advancing spark timing during intermittent series of compression strokes for each cylinder of a spark-ignition, internal-combustion engine in turn.