I also learned the three things that makes us mammals: hair, three tiny bones in the middle portion of the ear and their mother's give milk. There is also a fantastic movie about the mammal family reunion which is a must see.
Then I headed to the National Museum of American History and saw an exhibit on Lincoln:
As part of the Smithsonian-wide celebration of the 200th anniversary of Abraham Lincoln’s birth, the Museum will bring together—for the first time—its unique and unparalleled Lincoln collection. Through a focused selection of nationally important Lincoln artifacts, visitors will explore the life and times of this extraordinary figure. Each highlighted object will be augmented with personal stories told by Lincoln and the people who knew him best. The exhibition will showcase more than 60 historical treasures associated with Lincoln's life from an iron wedge he used to split wood in the early 1830s in New Salem, Ill., to his iconic top hat he wore the night he was shot at Ford’s Theatre. The exhibition will tell a new and very intimate story of the life and legacy of this remarkable individual.
I headed off to Ford's Theatre thinking I might take in a tour but I'd just missed one so I went to my final stop for the day.