barry petersen, denver. >>> there is a lot more just ahead on "cbs news roundup."y with us. >>> by one estimate, about two million american children and adolescents have a nonverbal learning disorder, or nvld. it affects a person's to problem solve, notice patterns and learn concepts. but up until now it was not a recognized medical condition. cbs' jarred hill has more. >> i have always known that i was different. >> reporter: ariel miller says it was things like playing by herself and problems with organization that tipped her mom off when she was young. >> i was always alone and spending time doing my school work instead of interacting with people, which was really scary for me. >> reporter: now 33, she has been living and coping with nonverbal learning disorder, or nvld. it affects nonverbal skills, especially understanding visual spacial processing. >> this might be the ability to pack the back of the carwell, or to follow the instructions to put together a piece of ikea furniture. for children, when they learn to do jigsaw puzzles, or when they're using legos

barry petersen, denver. ♪ and the home of the free ♪ >>> in a few hours, president biden will host president-elect the white house. it's the start of the peaceful transition of power, a hallmark of american democracy. four years ago, outgoing president trump did not invite mr. biden to the white house as he challenged his election loss. traditionally, these oval office meetings include a photo op, and some of those photos go down in history. robert costa reports. >> wow, is this where everything is stored? >> yes indeed. this will where you will find the majority of our photographs. >> reporter: deep inside the national portrait gallery archives in washington, d.c., curator ann shumard is showing us a gem of american history, the last formal photo taken of president abraham lincoln. >> it was taken on february 5th of 1865. the only portion of the image that's really in tight focus is his right hair, and i think that gives it an intimacy. there is also the crack that runs through the original negative from which this print was made. and that has always been interpreted as almost perhaps foretelling