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Will Grant passes through a small Mexican town whose economy depends fundamentally on people crossing the Sonoran desert and into the US - whether they have got papers or not. On the edge of the Sonoran desert, Altar's streets are lined with 'camping supply' shops selling everything migrants might need to wallk over the frontier - from bottled water and blankets to carpet slippers which cover their tracks.

In Montevideo, Ben Weisz meets Uruguay's unofficial 'First Couple', and hears what it was like to grow up gay during a dictatorship once derided as 'Latin America's torture chamber'. These men contracted the country's first gay marriage - as opposed to civil partnership - last year, and reflect on their public role and growing pride.

(Photo: Camouflage backpacks, on sale in Altar, Mexico - presumably to the migrants passing through town)