How many trees are there in the Amazon?

A couple of weeks ago some colleagues and I wrote a paper in Science reporting some new findings on Amazonian forests. Some of the findings are actually just numbers, and one of those numbers is really big. It's the number of trees we think probably grow in the Amazon, and it's 390 billion.

The Trilobite Paradoxides

The fossils of a large trilobite called Paradoxides are found in North America, Europe, and Africa, They crawled along the seafloor during the Cambrian Period, 510 million years ago, but not off the coast of North America or Europe. They lived in the shallow waters off the coast of a small continent that no longer exists called Avalonia by geologists.

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