Emma Jacobs reports on Senator Pat Toomey’s final efforts in the proposed gun buyer background check legislation. Dave Heller talks with local runners organizing a run to honor those affected by the Boston Marathon bombing. Maiken Scott meets a researcher working on a treatment for teens who attempt suicide. Peter Crimmins learns about a local company’s commercial space travel plans. Howard Shapiro reviews the Arden Theater’s revival of A Raisin in the Sun.