In a fascinating research study, scientists are mapping the microbial ecosystems of the New York City subway system. The results are mindboggling, and involve snazzy tidbits like Antarctic germs and fish DNA and bubonic plague and the bacterial powers of pizza and hummus.
Related (and lazily truncated) news popped up over the last week about the study, focusing on "50% unidentified material" and CHUD jokes and such. But the whole thing is worth a read, as is the Cell journal article.
Seriously. It's totally cool.