The doctor isn't in, but he can still see you now. Remote presence robots are allowing physicians to "beam" themselves into hospitals to diagnose patients and offer medical advice during emergencies. A growing number of hospitals in California and other states are using telepresence robots to expand access to medical specialists, especially in rural areas where there's a shortage of doctors. These mobile video-conferencing machines move on wheels and typically stand about 5 feet, with a large screen that projects a doctor's face. They feature cameras, microphones and speakers that allow physicians and patients to see and talk to each other.