https://phys.org/news/2018-06-gauging-ice-sheet-movement-sea-level-rise.html

University of Kansas researchers Leigh Stearns, associate professor of geology and research scientist at the Center for Remote Sensing of Ice Sheets, and Cornelis van der Veen, professor of geography, discovered friction—or "basal drag"—between ice sheets and the hard bed underneath has no influence on how fast glaciers flow.

This finding throws out a notion that has colored estimates of glacier speed for decades.