The Russians now say that they have not found any previously unknown life forms in the sample from Lake Vostok.

The uncertainty of science: The Russians now say that they have not found any previously unknown life forms in the sample from Lake Vostok.

Sergei Bulat of the genetics laboratory at the Saint Petersburg Institute of Nuclear Physics had said Thursday that samples obtained from the underground Lake Vostok in May 2012 contained a bacteria bearing no resemblance to existing types. But the head of the genetics laboratory at the same institute said on Saturday that the strange life forms were in fact nothing but contaminants.

It appears that the earlier announcement was either premature, or inappropriate.