FOOTPRINTS painted in bright colours on the floor pass through the bustle of the Themba Lethu clinic in Johannesburg. They lead to a room where every week dozens of men are circumcised. Heterosexual men who get the snip cut their chances of contracting HIV by more than half, since the foreskin is delicate and tears easily. In South Africa, the country that has the world’s largest number of HIV-infected people, such initiatives can save a lot of lives.

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