China has seen many of its most able scholars find homes and produce path-breaking work in other countries. In recent years, it’s permitted recruited scholars to be based in China on a part-time basis. This has led to tensions with the United States, which wants research funded in full or in part by American sources to benefit itself. Some scholars have been accused of violating U.S. laws on double-dipping and disclosure. Collaborative U.S.-China research is under a cloud.