also this week's medical mystery. something we do every night could be making us gain weight. i'll tell you about it. let's get started. doctors may have unlocked a big secret which would help patients with the deadliest form of brain cancer. i's called glioblastoma. about 10,000 new kaszs in the united states every year. it's the same type of cancer that took the life of senator ted kennedy. there's a new vaccine out there that nearly doubled the survival time. double. think about that. it's extra time. it's what the patient you are about to meet, every patient, really, is fighting for. >> you volunteered to do a spinal tap today for us? >> yes. >> she's bracing for another painful procedure.