Getting the PCA recitation ready
Getting the PCA recitation ready


Former-commit-id: 0521520d861421cc8256fc0ccde4866bb0cf80da [formerly d973e32265a20d22f7d2638a16635dceaae3dc61]
Former-commit-id: ef4ce9de03e925533626f1a8a4874b900ec70d64
justinbois/bebi103_utils