the process of a species or group of animals becoming extinct (dying out).

A scientist wearing thick blue gloves uses tongs to dip test tubes into a bath of liquid nitrogen. Steam rises from the cold-looking liquid.

Cells, Frozen in Time

Risa Aria Schnebly

If a living organism freezes, it can die. But by freezing living cells at just the right temperature, scientists can preserve living cells instead of killing them.

Read more about Pleistocene Rewilding and De-Extinction

Pleistocene Rewilding

Path through the snow with animal tracks. — Animal tracks through the snow in Siberia.

Where the Rewilded Things Are

Challie Facemire

Humans change the world around us in many ways, cutting down trees, building roads, using resources. But what happens when we try to restore some of the things an area has lost? And should we try to do so?

Read more about Fossils Rewrite History

Scientists thought that flying reptiles known as Pterosaurs were slowly dying off before an asteroid caused a huge die-off on Earth. But new fossils found in Africa tell a different story.

Leslie Minton

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