We know there were animals during Earth’s chilliest era—but we still don't know what they look like. By Chris Baraniuk / Hakai Magazine Published Dec 23, 2022 6:00 PM EST This article was originally ...

Planet Earth used to be something like a cross between a deep freeze and a car crusher. During vast stretches of the planet’s history, oceans from pole to pole were covered with a blanket of ice a ...

Scientists believe that at several times in Earth’s history the planet was covered by ice. Science History Images / Alamy Stock Photo This article is from Hakai Magazine, an online publication about ...

Lacking bones, brains, and even a complete gut, the body plans of simple animals like sea anemones appear to have little in common with humans and their vertebrate kin. Nevertheless, new research ...