“…Cropley, Kaufman and Cropley, 2008;Gill, Horgan, Hunter and Cushenbery, 2013;Gill, 2017) and learning by terrorists (e.g. Jackson, Baker and Cragin, 2005;Ranstorp and Normark, 2015;Kettle and Mumford, 2017;Goerzig, 2019). These efforts often overlap and are not mutually exclusive.…”