World’s tiniest nano-engine

Just a few billionths of a metre in size, the world’s tiniest engine uses light to power itself and works at scales smaller than a human cell. The nanoscale engine could form the basis of nano-machines that can navigate in water, sense the environment around them, or even enter living cells to fight disease
The simple device consists of tiny charged particles of gold bound into a polymer resin gel.
These ‘actuating nano-transducers’, or Ants, can deliver almost a hundred times more force per unit weight than any existing engine or muscle cell, said the Cambridge scientists who developed them.