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Tasmania's giant ash trees may be world's tallest. Stephen Sillett's laboratory is dangling 90 metres above the ground. It is an intricate web of ropes and instruments strung up in the branches of a tree. And in the windy conditions that plague Tasmania's forests, it can be distinctly precarious.
The tallest tree in the world is named Hyperion, which reaches 379.7 feet (115.7 meters). Redwoods can achieve a diameter of 24 feet (7 meters), and 1.6 million pounds (725,700 kg). These giants can live to be 2,000 years old and have graced the planet for more than 240 million years.