(1) time management, (2) getting started, (3) establishing a culture that stresses student self-management, (4) managing student groups, (5) working with others outside the classroom, (6) getting the most out of technological resources and (7) assessing students and evaluating projects

We would add two other problem areas: teaching PBL skills and balancing the teaching of PBL skills with the learning of subject-domain specific content. Of course, management principles for the practicing PBL teacher exist; the study of expert PBL teachers identified 53 such "classroom management principles." However, the systematic learning of these principles by practicing PBL teachers is not a simple matter.

Composite metal foams (CMFs) are tough enough to turn an armor-piercing bullet into dust on impact

. Given that these foams are also lighter than metal plating, the material has obvious implications for creating new types of body and vehicle armor – and that's just the beginning of its potential uses.