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** Could be. Don't forget that speedsters are a quick study (we've seen Barry read entire textbooks in a matter of seconds) and retain information rather well, and Thawne is explicitly a genius in his own time who learned astrophysics in Kindergarten. So if he didn't already have the knowledge of how to perform heart surgery, it would take him about five seconds to get that knowledge.
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** Plus, Kryptonians have no trouble passing as humans on any Earth, looking as uncannily human as they do.
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** Also, Caitlin explained that Earth-1 Wells was impersonated literally right after Cisco first explained to Harry what "Wells" did to Barry.
