I don't know if you all heard about the big NASA press conference yesterday. It was hyped as being a major advancement in astrobiology. Turns out that a study of extremeophile bacteria found one that can use arsenic instead of phosphorus in key biological molecules. Admittedly, that's not so surprising to me since arsenic and phosphorus are chemically very similar... Now, if they'd found something that could replace carbon in its cells, that I'd be impressed with.
There were some very bad attempts at science humor too. "Those aren't potatoes!" Sigh.
Today's XKCD covers it nicely: