Grey's Anatomy: Season 7, Episode 13

7 - 13: Don't Deceive Me

Derek breaks ground on his Alzheimer's clinical trial and Meredith can't help but feel left out. Bailey's attempt to take the hospital into the age of new media with live tweets from the OR does not go over well with the Chief. Callie, Mark and Arizona must learn to navigate through the pregnancy together, which starts off with Callie driving her new obstetrician crazy.