Her husband pulled down a box and opened it. “This is our collection of blood spots,” he said with quiet pride. Borneo is off the beaten path and, I suppose, not many science journalists visit. Inside the box was a neat file of plastic envelopes, each one containing a piece of porous paper no bigger than a business card; on each card was a rusty black spot. Near the center of the dark spot, on the card I inspected closely, was a perfectly round little hole. The punched dot, missing there, had already surrendered its secrets to science. DNA confetti.