"GREY'S ANATOMY - ""Don't Deceive Me (Please Don't Go)"" - 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; and Callie, Mark and Arizona must learn to navigate through the pregnancy together, which starts off with Callie driving her new obstetrician (guest star Rachael Taylor) crazy, on ""Grey's Anatomy,"" THURSDAY, FEBRUARY 3 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/RANDY HOLMES)HARRISON PAGE, EVANS BROWN"