Hans Rosling unveils data visuals that untangle the complex risk factors of one of the world's deadliest (and most misunderstood) diseases: HIV. By following the data, he suggests a surprising key to ending the epidemic.

In the last two to three years, we have reached a steady state of HIV epidemic in the world. 25 years it took. But, steady state doesn't mean that things are getting better, it's just that they have stopped getting worse. And it has -- the steady state is, more or less, one percent of the adult world population is HIV-infected.