cold fjord writes: BBC reports, "For the first time, scientists have placed tiny motors inside living human cells and steered them magnetically. The advance represents another step towards molecular machines that can be used, for example, to release drugs into specific locations within the body. There is interest in the approach because it could enhance the benefits of drugs while minimising side effects. The rocket-shaped metal particles were propelled using ultrasound pulses. Materials scientist Prof Tom Mallouk, from Penn State University, and colleagues have published their research in the journal Angewandte Chemie International Edition. "As these nanomotors move around and bump into structures inside the cells, the live cells show internal mechanical responses that no one has seen before," said Prof Mallouk. "This research is a vivid demonstration that it may be possible to use synthetic nanomotors to study cell biology in new ways.""