Classes began this week for students at the University at Buffalo, a public research university in western New York, but there were about 750 fewer international students on campus than expected.The new students who did make it gathered for a welcome from the school's dean of students. "We know you have had to overcome hurdles to be here – especially this summer, with visas," Tomás Aguirre told the assembled students, representing more than 100 countries. "And I just wanted you to know that we a...