Relatively few firms today can manufacture actuators at scale with a high level of precision, and these components are still a long way from the incredibly engineered muscles that allow animals to move with such grace and efficiency.
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Music-lover Adam, 27, from the Wirral said he has been to more than 200 concerts and estimates he goes to just under 30 every year.
Last summer Greg met Lucy, now in her 20s, for the first time.
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