10 is arsenic-based life:
A report in 2010 claimed that a weird form of life incorporates arsenic in place of phosphorus in biological molecules. This one sounded rather suspicious, but the evidence, at first glance, looked pretty good. Not so good at second glance, though. And arsenic-based life never made it into the textbooks.Tom Siegfried, “These are science’s Top 10 erroneous results” at ScienceNews
Here’s the update at Nature (2012) re arsenic-based life.
Many of the mistakes listed seem just to be natural, though incorrect, assumptions of their day. This arsenic-based life though, now that was intriguing, if wrong.
Amazingly, there are some things bacteria haven’t been able to do, so far as we know.
The BBC was willing to consider it: