1) What have have been recent advances on manifold clustering? a) Algebraic approaches b) Spectral approaches c) Probabilistic approaches 2) What have been successful applications of manifold clustering? 3) What is the role of topology, geometry, and statistics, in manifold learning, i.e., a) clustering based on the dimensions of the manifolds b) clustering based on geometry c) clustering based on statistics 3) What are the open problems in manifold clustering?