This documentary unravels the extraordinary transformation that connects prehistoric dinosaurs to the birds seen today.

Fossilized footprints in Saudi Arabia show human traffic on the cusp of a subsequent ice age. Like carbon dating, scientists use isotopes and context clues to calculate the approximate age of fossils.

Editor’s note: A version of this story appeared in CNN’s Wonder Theory science newsletter. To get it in your inbox, sign up for free here. Tens of thousands of years ago, our species — Homo sapiens — ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Fossilized bone ...

Maszycka Cave in southern Poland, where archaeologists unearthed 18,000-year-old bones that show evidence of human manipulation Darek Bobak Archaeologists in Poland have discovered widespread evidence ...

Romantic kissing likely evolved for the first time in a common ancestor of humans and other large apes about 21 million years ...