A wave of new research is forcing paleontologists to reconsider a basic question about life on Earth: when did the first mass extinction actually happen? Three studies published across Nature, Science ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

The Ordovician Period followed the Cambrian and it is recognized as a separate time interval because of differences in the kinds of animals found in each. As we saw in Chapter 3, the Cambrian came to ...

Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian ...

As life on Earth rapidly expanded a little over 500 million years ago during the Cambrian explosion, Earth had tectonic plates slowly crashing into each other, building mountains and starting a series ...

The Cambrian explosion, long hailed as one of the most significant events in the history of life on Earth, has now been brought into question. New research suggests that this dramatic burst of ...