Scary chart of worldwide HIV/AIDS cases since 1980. Aaargh! It's World AIDS day on December 1st, and there's no end of depressing statistics to go around, with lots relating to sub-Saharan Africa (28 million infected, 2.8 million will die this year). It's just stupid that an easily preventable, sexually transmitted disease can infect 6 people in every 1000 worldwide. Sigh.