The curious minds at What If take a journey through the Earth during the Cenozoic era. President Trump addresses the nation ...

The finished dugout canoe before departure, with leaf wave guards at the bow (right) and stern (left). Vertical sticks at bow ...

Mothers have the hardest job in the world. Caring for babies is full-time work, and this labor extends to the animal world.

That puts Megatooth, and probably some of its ancestors, at the top step of the prehistoric food chain when it stalked the seas during the Cenozoic era, which began about 66 million years ago and ...