There's nothing like an outbreak of Ebola virus to guarantee screaming headlines. That's largely due to the mid-1990s bestseller The Hot Zone, which described the disease's horrifying course in gruesome detail, leaving many readers to believe that Ebola posed a looming threat to human existence. The truth is, however, that since the first recorded human cases in the 1970s, only a few hundred people have died from it. Of all the diseases you need to be afraid of, Ebola is near the bottom of the list.
Unless, that is, you're a gorilla. Over the past decade or so, tens of thousands...