dan riskin. we'll be back with more of "consider this." sider this." >> now inroducing, the new al jazeea america mobile news app. get our exclusive in depth, reporting when you want it. a global perspective wherever you are. the major headlines in context. mashable says... you'll never miss the latest news >> they will continue looking for suvivors... >> the potential for energy production is huge... >> no noise, no clutter, just real reporting. the new al jazeera america mobile app, available for your apple and android mobile device. download it now the night's events, a smarter start to your day. mornings on al jazeera america this. >> did dracula have it right? the fictional vampire fed on the blood of others. and it kept him vibrant. >>> older mice could be kept young by infusions of blood from younger mice, improving memory and learning. dr. amy majorrers is a professor of stem sel cell and regenera tf biology. could you explain the basis of the experiment with mice and what you found? >> thank you, sure, i would be happy to. we were searc