"Nodding Syndrome: A Devastating Medical Mystery In Uganda."

"Santiana says that for Denis, as with most children affected, it began with the pathological nodding of the head nearly a decade ago."

He's 16 now, she says, but you can only get a glimpse of his age in his face – he looks half the size you'd expect him to be. He rarely moves. He hardly speaks. If he wants water, she says, he'll take a cup nearby and tap the cement floor with it. Most everything else is nonsense, hallucinations.

"He's just in his own world," Nyeko says.