Today's actuators, even the state-of-the-art ones, are still largely made from metals, hard plastics and electronics. But there are other ideas around. Tolley and his colleagues have been working on a very different approach.
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A spokesperson for Birmingham Children's Trust said following a request from the family it was reviewing the decision made about support for Tilly.
"We've got to get those astronauts to the Moon and then back again, completely safely," says Cleaver.
Manjit Sangha wants to raise awareness around sepsis after leaving hospital following seven months of treatment