The direction of this velocity is perpendicular to the line connecting G and C. This is true because at that instant, BD is rotating about the instant center C. The direction of rotation of link BD ...

Researchers in China and the UK have made a new type of nanometre-sized rotor with an off-centre axis of rotation. The researchers have also made arrays of the devices that spread over distances as ...

Three-dimensional reconstruction and modelling of limb joint mobility in the early tetrapod Ichthyostega is used to provide insights into an important step in vertebrate evolution—the transition ...