The literary reinvention of Capitol Hill continues with Ada's Technical Books, a science-minded bookstore at the north end of Broadway. Ada's is a small, attractive space packed with new and used technical books about computer science; a small, well-curated sci-fi section; scientist biographies; and just about any scientific thing you can think of (including Robot magazine). Ada's also carries a few nifty nonbook accoutrements that no nerd should be without (Buckyballs!), making it the giddiest, geekiest, most essential stop on your Christmas-shopping death march. (Ada's Technical Books, 713 Broadway E, 322-1058, 10 am–8 pm)