The HON paper received valuable comments from Yuxiao Dong, Reid Johnson and David Lodge.

The HON introduction video is designed by Mayra Duarte in The Lucy Family Institute for Data & Society.

This work is based on research supported by:

• University of Notre Dame Office of Research via Environmental Change Initiative (ECI)

• NSF awards EF-1427157, IIS-1447795, BCS-1229450, IIS-1456763, IIS-1455886 and ACI-1029584

• Army Research Laboratory, and was accomplished under Cooperative Agreement no. W911NF-09-2-0053 [the ARL Network Science CTA (Collaborative Technology Alliance)].

• The Lucy Family Institute for Data & Society, Notre Dame