Russian scientists working at a 'graveyard' of extinct mammoths and woolly rhinos in Siberia claim to have found a bacterium which could prolong human virility and life span.

Already nicknamed 'pre-historic Viagra', experiments on mice show it increases mental alertness, physical prowess and sexual activity, with females reportedly having babies into old age.

The findings are an unexpected byproduct of detailed research into the extinct creatures whose well-preserved remains have been found in the permafrost Yakutia region of eastern Russia. 

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