A great biology-related comic in xkcd (one of my favorite comics but typically more physics or computer science related)!
The extra text says "According to a new paper published in the journal Science, reporters are unable to thrive in an arsenic-rich environment.
Now, the interesting thing is that the new bacteria are not naturally arsenic based. Here's more info from the NYTimes, for those who are interested. In a nutshell, there are some bacteria that will incorporate arsenic into their DNA when grown in the lab. This is neat because arsenic is a poison to us, but it's apparently not a poison to everything. The bacteria are using the arsenic in place of phosphorous in their DNA. The molecules are chemically similar, so it's not entirely a crazy proposition.
Still, the implications are that life can form from different molecules, so there's more than one possible paradigm for life. This doesn't guarantee that there's, say, silicon-based life out there . . . but it is definitely possible, and researchers have now shown this empirically. An exciting step forward for science, for sure.