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'''2015 Problem –''' ''Stem Sells: What is Higher Education Really Worth?''<br>
'''2016 Problem –''' ''Share and (Car) Share Alike – Modeling New Approaches to Mobility''<br>
'''2017 Problem –''' ''From Sea to Shining Sea: Looking Ahead with the National Park Service''<br>
'''2018 Problem –''' ''Better Ate Than Never: Reducing Food Waste''<br>
'''2019 Problem –''' ''One is Too Many and A Thousand Not Enough: Substance Use and Abuse''<br>
'''2020 Problem –''' ''Keep On Trucking: U.S. Big Rigs Turnover From Diesel to Electric''<br>
'''2021 Problem –''' ''Defeating the Digital Divide: Internet Costs, Needs, and Optimal Planning''<br>
==Judging==
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