GREATEST ARTWORKS OF THE 20TH CENTURY Co-sponsored by the Lincoln Library and the COA, in this 5-week free course the genius behind various 20th century artworks and artists — from Picasso to Pollack and beyond — will be revealed and the group will discuss their own thoughts and reactions to each piece. The course will be from 3 to 4:30 pm at the Library on Saturdays September 23 and 30, and October 7, 21, and 28. It is open to all adults. Please sign up by calling the Library at (781) 259-8465.