“和平之墙”和巴黎的埃菲尔铁塔 © Prisma by Dukas Presseagentur GmbH/Alamy
All is not as it appears to be here at the Pando, in Utah\'s Fish Lake National Forest. At first glance, visitors likely see a massive grove of quaking aspen trees, their leaves dancing in the wind. But the Pando is not many trees; instead, it\'s a single organism. Like many aspen groves, each of the 40,000 trees in the Pando are genetically identical stems that sprout from the same root system. First discovered in 1968, the Pando made waves in the scientific world. It\'s become recognized as one of the heaviest known organisms—weighing 6,000 metric tons—and one of the oldest known living organisms. Scientists estimate it\'s upwards of 80,000 years old, having endured the last ice age and countless forest fires. It got to be so old partly because most of the organism is protected underground. So, while an individual stem can die, the organism as a whole survives.

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© Prisma by Dukas Presseagentur GmbH/Alamy
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