Barack Obama's speech in Cairo last week was, of course, addressed as much to Americans as to Cairenes (or for that matter Muslims). The crowd hardly needed to be reminded of their civilisation's accomplishments in maths, science and learning; but many Americans could surely benefit from the history lesson the president so succinctly and eloquently provided. Likewise, most Egyptians know that there are worse places to be Muslim than the US: that's why so many of them are desperate for American visas. Europeans, on the other hand, could learn something from American tolerance of the hijab.