Scientists say a patch of ancient seagrass in the Mediterranean is up to 200,000 years and could be the oldest known living thing on Earth. Australian researchers, who genetically sampled the seagrass covering 40 sites from Spain to Cyprus, say it is one of the world's most resilient organisms - but it has now begun to decline due to global warming. The analysis, published in the journal PLos ONE, found the seagrass was between 12,000 and 200,000 years old and was most likely to be at least 100,000 years old. This is far older than the current known oldest species,...