DCist reminded you a few times about the USA Science & Engineering Festival which happened on the National Mall this past weekend, so we hope you didn’t miss out on the mass nerdgasm. The second annual festival was an enormous affair, with hundreds of booths lined up on the Mall between 7th Street and the Capitol grounds — even more booths took up all of Freedom and Wilson Plazas and filled the Mellon Auditorium. Eager and personable representatives led games and activities like robot soccer, Science Plinko and a spacecraft simulator.