Movie S1.

Crack propagation occurs on fast timescales. Color change due to internal reflection from newly formed surface.

Controlling fracture cascades through twisting and quenching

Ronald H. Heisser, Vishal P. Patil, Norbert Stoop, Emmanuel Villermaux, and Jörn Dunkel

PNAS. 2018. 115:8665-8670 DOI: 10.1073/pnas.1802831115