Fear of ‘foreigners’ may slow scientific progress

Saria Mohamed Hassan’s dream of becoming a doctor was interrupted for a year when she left the United States to conduct a brief malaria workshop in Dakar, Senegal, and then found herself stranded in a bureaucratic no-man’s land: Her international student visa had expired while she was away, and her bid to renew it quickly became mired in a massive, ever-growing backlog of cases under review. Faced with a seemingly impenetrable firewall of post-9/11 security procedures, the Sudanese medical student eventually lost a year’s worth of classes at Harvard.