The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

There are over 7 billion people living on the earth right now. Tens of millions are born and die each year. Every single one ...

So far, so not science. However, in 2018 two University of Cambridge scientists named their paper The Silurian hypothesis: ...