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. During my visit, I traveled through a “particle accelerator,” played hopscotch in a computer programming demonstration, and discovered my camera phone “sees” a wider range of light than my eyes do. (I opted to skip the enormous line for the Tron simulator, though.) Even the full two days of the festival might not have been enough to experience everything happening at this scientific Disneyworld. We can only assume the huge crowds meant a check in the success column for the festival, so they’ll come back again for another year. Science!