let us know what you think. join the live chat at ac360.com. join viewers around america and the world. the ash cloud causing worldwide chaos. it's unbelievable. thousands of flights canceled, airports shut down. a lot of travelers caught in limbo. an erupting volcano in iceland is the cause. gary tuchman is there. we'll talk to him coming up. he's on the ground. and how dangerous is that ash? we'll show you one passenger jet's close call decades ago. first, the smoke filled the cabin, then came to flames. the engines caught on fire. incredible story of survival ahead. and what you don't know about jack kevorkian. the doctor who helped more than 130 people die. he's not sure of the exact number. he joins us with the big "360 interview." a fascinating, candid interview with the man at the center of this life-and-death issue. [ male announcer ] when we built our first hybrid, youtube didn't exist. and facebook was still run out of a dorm room. when we built our first hybrid, more people had landlines than cell phones, and gas was $1.75 a gallon. and now, while other luxury carmakers are building their first hybrids, lexus hybrids have traveled 5.5 billion miles.