| http://www.w3.org/ns/prov#value | - About 17 feet in diameter at their common base, the trees are middle-aged for giant sequoias, which can live 4,000 years and have the greatest mass of any living organism on Earth.The Forest Service is not sure why the trees hit the dirt Sept. 30, because they appeared to be healthy.A German tourist, one of only a few people on the 1.3-mile loop trail at the time, recorded the crash on video.It ca
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