david pogue: what's going wrong with our batteries? reporter: massive recall. pogue: they're critical for electric vehicles and fighting climate change. we need renewable energy storage. pogue: which elements can solve the world's problems? hmm... pumpkin spice. i'm david pogue. can batteries be better? it's still on! more powerful? oh! cleaner? the stakes are huge as we search for the super battery. next time on nova. narrator: how did it happen that a wild harbor seal found life-long friendship with a salty guy from maine? harry goodridge: why he's so popular? he's great, that's why. narrator: over 25 years, man and seal cemented a bond that hundreds of miles of ocean and even blindness couldn't break. he thinks i'm his mother. narrator: this is the story of andre, the seal who came home. an animal born to be wild, the rarest of bonds with a human, a friendship across the divide, a story of unbreakable devotion.

." >> pauley: with david pogue we'll do a double take over dead actors playing new roles. elizabeth palmer shows us how one man directs movies through his eyes. we'll also hit the beach with an oscar-nominated animated short. first, here are the headlines for sunday morning, the 26th of february, 2017. 28 people were hurt last night, some pickup truck plowed into a crowd watching a mardi gras parade in new orleans. one person is in custody. police suspect he was intoxicated. influential republican congressman darrl issa of california is calling for an invest bakes into russia's activities in the 2016 presidential election. issa also says it would be improper for attorney general jeff sessions to who was prominent member of the trump campaign to lead the investigation. former labor secretary tom perez is the new chairman of the democratic national committee and the first latino to hold the job. his election is seen for a win of the moderate wing of the party. in brazil, carnival celebrations are in full swing, thousands turned owl to celebrate. they will party until ash wed

david pogue reports. >> a major weapons test is imminent.hat it is and how to destroy it. >> reporter: the new "star wars" movie was a big hit at the box office. exciting story, thrilling effects, and gifted actors. including one who has been dead for over 20 years. >> i will tell him that his patience has been rewarded with a weapon to bring a swift end to the rebellion. >> reporter: that's ri cushing, reprizing his role, even though he passed away in 1994. how did they do that? actor guy henry performed the scenes, and the special effects engineers replaced his face with peter cushing's. >> the original plans for the station are kept there. >> reporter: how did the computer know exactly what peter cushing's face looked like, down to the tiniest detail? that's where paul comes in. at his office at the institute for creative technologies at the university of southern california, he's built a death star of his own. the light stage. >> so we're currently surrounded by over 10,000 l.e.d.s, and there's about 20 high quality dslr cameras, and we