The event horizon of a black hole is the point of no return — not a physical surface.

Insulin was first used to treat diabetes in the early 1920s.

Fact #1189 · Science

Fossilized footprints provide evidence of dinosaur behavior.

Fact #688 · Science

A teaspoon of neutron star material would weigh billions of tons.

Fact #1679 · Science

The Earth's inner core is solid despite extreme heat.

Fact #217 · Science

The stegosaurus had a brain about the size of a walnut.

Fact #627 · Science

The discovery of penicillin by Alexander Fleming revolutionized medicine.

Fact #1187 · Science

The door-in-the-face technique uses large requests to gain smaller agreements.

Fact #1502 · Science

The Stroop effect demonstrates how conflicting information can slow reaction time.

Fact #1463 · Science