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However, Tolley points out that humans don't move the way fans spin, at all. "We want to be able to lift things, and push things, and do things that require a lot of force and torque."
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His difficulties are an indication of a wider freeze in the US labour market, where job openings and hiring rates have dropped to multi-year lows.
"They need to get to a resolution," according to Emelia Probasco, Senior Fellow at Georgetown University's Center for Security and Emerging Technology.