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Translating to Soft Tissue:
Mechanical engineers help with knee injuries by developing computational models to characterize ligaments.


Farming Goes 3-Dimensional:
Vertical farming offers opportunities to grow more crops on a smaller footprint, especially in urban areas. It also presents unique educational opportunities.


Conor Walsh:
Pioneering soft exoskeletons


Directory of Contractor Associations

American Road & Transportation Builders Association
202-289-4434, www.artba.org

American Subcontractors Association
703-812-2000, ASAOffice@aol.com, www.asaonline.com

Associated Builders & Contractors
703-812-2000, www.abc.org

Associated General Contractors of America
202-393-2040, www.agc.org

Design-Build Institute of America
202-682-0110, dbia@dbia.org, www.dbia.org

Mechanical Contractors Association of America
301-869-5800, www.mcaa.org

National Association of Plumbing-Heating-Cooling Contractors
800-533-7694, naphcc@naphcc.org, www.naphcc.org

National Electrical Contractors Association
301-657-3110, neca@necanet.org, www.necanet.org

National Roofing Contractors Association
847-299-9070, nrca@nrca.net, www.roofonline.org

National Utility Contractors Association
703-358-9300, www.nuca.com

Progressive Engineer
Editor: Tom Gibson
2820 Mexico Rd., Milton, PA 17847
570-713-4812 * tom@progressiveengineer.com
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