(Figure 2b). Initially all silk samples demonstrated the same rate of fiber development over the range of natural spinning temperatures tested (Figure 2b, grey squares), this we attribute to initial stretching and orientation of the molecules at high shear rates. However temperature-dependent rates of fibrillation were soon adopted (Figure 2b, black lines). For both 27 C and 40 C these new rates are identical, whereas only a small deviation from alignment of particles observed in non-Newtonian viscoelastic liquid (polymer solutions) would follow a comparable straincontrolled process.[17]