A single Posidonia australis seagrass covers 77 square miles off western Australia
(Newser) -
Scientists have discovered what is arguably the world's largest living organism, which is roughly the size of 20,000 football fields and about 4,500 years old. It's a seagrass known as Poseidon's ribbon weed, or Posidonia australis, which started as a seed spawned from two different...