Ninety two year old Jean Stuetzle of Mountain View, California was diagnosed with lung cancer. However doctors had determined that chemotherapy or surgery were risky options for her age. Radiation oncologist Robert Sinha at the El Camino Hospital in Silicon Valley informed Stuetzle about technology called CyberKnife. CyberKnife is a robotic device that uses targeted radiation for eliminating tumors. There are some limitations with CyberKnife. Watch the video to learn more. [ZDNet]