Found this blog on another blog - DIY Science.
I was very fascinated by the work this Hell Goo guy does - basically he's just letting foods, pills, spit, animals, etc. to rot in a jar. He's occasionally changing the conditons and constantly throwing in new stuff.
With all the mold and bacteria, he's making that jar quite disgusting to look at. Supposedly hazardous, too.
Hell goo - Blog about growing bacteria in jar for half a year.
Hell goo 2 - New project, same guy.