You’re the only one, the Americans told Amnah Alkhan. We’ve never really talked with other girls who wear head scarves. Just you. Arizona State University, where Amnah is a senior, has no shortage of observant Muslim women who cover their hair with the scarf known as a hijab. There are 775 students, like Amnah, from Saudi Arabia; most of the women, though not all, wear the hijab. Some are fully veiled. Amnah is funny and frank and speaks with a directness that puts people at ease. She had agreed to survey Arizona State students for the Saudi women’s club on campus, of which she’s a member. But it can be tough to talk with Americans about their impressions of Saudi women when they don’t know any.