As they do so, each pair applies pressure to a soft ring around the driveshaft. The pulsating muscles collectively and continuously pinch the shaft and apply a rotational force, causing it to turn.

Labelling the structures "legacies of a xenophobic age", the pair hope that the bunkers can be as powerful a force for reconstruction as they were for a war that never happened.

A pair of dissimilar metal wires that generates an electrical force at a point of contact that varies in proportion to temperature.