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Stricter Chinese student visas raise alarm.

Reversing yet another policy of the previous administration, the U.S. Department of State this week began to apply tougher restrictions on some Chinese graduate students. The new policy shortens from 5 years to 1 year the duration of visas for those planning to study aviation, robotics, and advanced manufacturing. It will make it harder for the affected Chinese students to attend international conferences and to work collaboratively with scientists abroad, say U.S. higher education officials. It may also curtail periodic visits back home. Although the ostensible reason for the change is to improve national security, U.S. university officials see it as one more assault on graduate education and the free flow of scientific knowledge. When added to other policies by the current administration that affect non-U.S. citizens, the change may give talented foreign students one more reason to pursue advanced degrees in countries with lower barriers to entry.