Fusion power usually conjures images of massive industrial facilities laced with large lasers or magnets, but a startup in Cambridge, Massachusetts, has been quietly building a device that can fit on a tabletop. The optics of the device were on display behind Yun Kai, co-founder and CEO of Cambridge Heavy Industries , while he chatted with me on a video call. The company has been operating in stealth out of a small lab near MIT, and Kai gave TechCrunch an exclusive look at the technology it has…
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