Ecosystem services — the free benefits nature provides — are estimated at $125–145 trillion per year.

Electric currents generate magnetic fields.

Fact #93 · Science

In 1979, a computer error nearly triggered a false nuclear alarm in the United States.

Fact #799 · Science

In 1958, a nuclear bomb was accidentally lost off the coast of Georgia.

Fact #798 · Science

Atoms are made of protons, neutrons, and electrons.

Fact #60 · Science

Prehistoric ecosystems were diverse and dynamic.

Fact #754 · Science

The Earth's magnetic field is generated by its outer core.

Fact #331 · Science

The Earth's atmosphere blocks much of the Sun's harmful radiation.

Fact #113 · Science

The Earth's magnetic field originates in its molten outer core.

Fact #234 · Science