Brazil Rare Disease
In this March 4, 2014 photo, Joao Goncalves da Silva, 80, talks with his wife Geraldina Aleixo da Silva, 75, at their home in the Araras community in Brazil's Goias state. Both suffer from a rare inherited skin disease known as xeroderma pigmentosum, or "XP." Experts say Araras has such a high incidence rate because the village was founded by only a few families and several were carriers of the disease, meaning it was passed to future generations as villagers intermarried. (AP Photo/Eraldo Peres)
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Tucked into the sunbaked rolling hills of Brazil's midwest, Araras is home to what is though…
