Earthquakes occur when tectonic plates shift along faults.

Lightning can heat the air it passes through to temperatures hotter than the surface of the Sun.

Fact #5 · Science

The fossil record is incomplete but still informative.

Fact #743 · Science

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

Fact #338 · Science

Dark matter is believed to make up most of the universe’s mass but has not been directly observed.

Fact #1594 · Science

Time moves slower in stronger gravitational fields.

Fact #1755 · Science

Sound cannot travel through a vacuum.

Fact #136 · Science

Quantum particles can influence each other instantly across distance.

Fact #1764 · Science

The human eye can detect a single photon.

Fact #1706 · Science