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Look closely at Paul Telfer's tweezers and you will see a bloody piece of a monkey's tongue. Telfer cut this tongue sample from a dead Cercopithecus cephus that he found for sale (along with a porcupine) on the roadside near Franceville, Gabon, where he has a lab that later will test the sample for SIV, the HIV relative that infects simians. As we drive off, Telfer says, "That's priceless data, priceless data."

(Photograph by Malcolm Linton)

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Science. ISSN 0036-8075 (print), 1095-9203 (online)