In the wake of Follow a Museum Day, today is Ask a Curator Day on Twitter and several area museums are participating. Have a question about a particular collection or curation in general? Simply use the hashtag #askacurator in your tweet. The National Air and Space Museum, the to-be-constructed National Museum of African American History and Culture, the National Building Museum and the Freer and Sackler Galleries are just a few that appear to be actively answering questions.