Priestly held up a little fuzzy black ball with a red ribbon on it, lifting it carefully up by his shoulder so it didn't blend in too much with his black "surf naked" t-shirt. "HIV. Precursor to AIDs. Pretty sure all my contemporaries already know all about this one -- and if not, you should be ashamed -- but for the otherworldly and/or historical folks, this thing sucks ass. It totally destroys your immune system so you catch every little disease that comes your way, and they haven't found a cure yet. Just a huge, very expensive drug cocktail that will probably keep some of the more common sicknesses away. Seriously, this sucker's like a guaranteed death sentence." Priestly tossed the black microbe into the air a few times. "Yet surprisingly cute."