Cracking knuckles does not cause arthritis — it releases gas bubbles trapped in the synovial fluid.

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

Fact #338 · Science

There are more possible chess games than atoms.

Fact #1694 · Science

The development of chemotherapy advanced cancer treatment.

Fact #1216 · Science

Handwashing protocols significantly reduced hospital infections.

Fact #1214 · Science

Lightning is hotter than the Sun.

Fact #1698 · Science

Archaeopteryx shows characteristics of both dinosaurs and birds.

Fact #681 · Science

Sound cannot travel through a vacuum.

Fact #136 · Science

Archaeopteryx is considered a transitional fossil between dinosaurs and birds.

Fact #624 · Science