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says the study’s senior author, Xuanhe Zhao, professor of mechanical engineering and civil and environmental engineering at MIT.

The study also includes lead authors Chonghe Wang and Xiaoyu Chen, and co-authors Liu Wang, Mitsutoshi Makihata, and Tao Zhao at MIT, along with Hsiao-Chuan Liu of the Mayo Clinic in Rochester, Minnesota.

It's likely all or most of the researchers were immigrants/foreign. And yet we have overly restrictive immigration policies for high skilled workers that basically means we educate them and then return them back to their country.