One Saturday each month, the Pacific Science Center of Seattle opens early for people with autism spectrum disorders. John Keatley/Pacific Science Center hide caption

itoggle caption John Keatley/Pacific Science Center

Elspeth Ventresca, center, and the rest of Carolyn Barnhardt's prekindergarten class at John Eaton Elementary School wear the crowns they made to celebrate Rev. Martin Luther King Jr.'s birthday. Emily Jan/NPR hide caption

itoggle caption Emily Jan/NPR

CSIT-In-3 students Daniel Diaz (left) and Brian De Anda map out options for reducing the size of a mobile app their team is building. Krista Almanzan/KAZU hide caption

itoggle caption Krista Almanzan/KAZU

A new U.S. citizen holds an American flag during a naturalization ceremony in July. An Arizona law will require graduating high school seniors to pass the same civics test given to candidates for U.S. citizenship. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP