Obese, those patients have to heart disease, less complications or less chance of death or chance of getting one of these pumps, left ventricular device. >> jamie: why? >> they don't make it clear. the theory behind it maybe they have more of the fatty tissue that can be fuel reserves and the heart can go on longer, maybe more muscle around the heart to pump longer and one other theory is that maybe the doctors more attentive to obese patients and having real heart failure and jump in compared to normal. and at this point these are theories. >> jamie: that's fascinating. >> it is. it doesn't t...