Tread Carefully

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Shaimaa Khalil joins a polio vaccination team on the streets of Karachi, and hears why so many Pakistani parents are still suspicious of the scheme's motives; Thomas Fessy travels to the north of Cameroon, in the company of troops who're fighting the spillover of Boko Haram attacks into their country; Hamilton Wende finds Algiers still full of "pockets of half-remembered history" after Algeria's devastating wars of independence and counterinsurgency; Chris Bockman meets a French rugby hero who is in fact a Syrian-born construction magnate big in the scaffolding business; and Amy Guttman takes the plunge in Iran - to go swimming in a public pool in Yazd. Photo: A Cameroonian soldier looks at the border through binoculars in Amchide, northern Cameroon, 1 km from Nigeria, which has been repeatedly raided by Islamists from Nigeria's Boko Haram group. Credit: Reinnier Kaze/AFP/Getty Images)