The human skeleton is completely replaced roughly every 10 years through a process called bone remodeling.

The Sumerians developed one of the earliest writing systems.

Fact #599 · Human Body

Atmospheric rivers can deliver massive amounts of rainfall.

Fact #845 · Human Body

The Earth's interior is layered into crust, mantle, and core.

Fact #338 · Human Body

The Earth's inner core is primarily iron and nickel.

Fact #150 · Human Body

Cats can rotate their ears independently.

Fact #1336 · Human Body

The human body replaces many of its cells regularly.

Fact #182 · Human Body

Your brain uses patterns to recognize faces almost instantly.

Fact #1760 · Human Body

Cats have a reflective layer in their eyes that improves night vision.

Fact #1367 · Human Body