I’d like to introduce you to Pando, the world’s heaviest and possibly oldest organism. Pando is a male quaking aspen tree in Utah's Fish Lake National Forest. Although it may look like a giant grove of separate trees, scientists found it is one organism with a single molecular structure. Pando weighs 6,600 tons and may date as far back as 80,000 years. Pando’s unity comes from its single root system.