Seems to have been developed in 2008 (continuing through 2017), which explains the "economical" framing: https://en.wikipedia.org/wiki/National_Academy_of_Engin

Seems to have been developed in 2008 (continuing through 2017), which explains the "economical" framing: https://en.wikipedia.org/wiki/National_Academy_of_Engineering#Development_of_the_Grand_Challenges_(2008) https://en.wikipedia.org/wiki/National_Academy_of_Engineerin...