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 ...