Pinot was among those involved in the huge pile-up just as the race entered the final three kilometres. Grazes were visible under his torn clothing as he pedalled, with a face like thunder, to the finish line.

Gyrotropization occurs at scales substantially larger than the shock width. Isotropization is much slower than gyrotropization and occurs at even significantly larger scales.

Bird migration routes favor marshes and river valleys, as do, more obviously, the movement of anadromous salmon and, the mirror image, catadromous eels, to mention only two of the numerous migrating fish species.

To judder to a halt