And with it, they’re learning how the predators see each other.

Anne Burkholder, a cattle farmer in Nebraska, talks about working and living in an area much more rural than the Florida city where she grew up.

Scientists and conservationists can't agree on which is a bigger threat to chimpanzees: the disease, or the medical research that might lead to an animal vaccine for it.

On how we know—and how we learn—what to fear

Life with humans turns these naturally incurious apes into explorers and better problem-solvers. That might provide clues to our own evolution.

They are culturally meaningful—and not at all worth the health risks they pose.