Back in May, we heard about Qualcomm's plans to hammer out details for an X PRIZE competition to invent a Star Trek-style tricorder. Now, reader Sven-Erik sends word that the requirements have been finalized and the competition has launched. "As envisioned for this competition, the device will be a tool capable of capturing key health metrics and diagnosing a set of 15 diseases. Metrics for health could include such elements as blood pressure, respiratory rate, and temperature. Ultimately, this tool will collect large volumes of data from ongoing measurement of health states through a combination of wireless sensors, imaging technologies, and portable, non-invasive laboratory replacements. Given that each team will take its own approach to design and functionality, the device's physical appearance and functionality may vary immensely from team to team. Indeed, the only stated limit on form is that the mass of its components together must be no greater than five pounds."