The stromatoline — layered mats of cyanobacteria — oxygenated Earth's atmosphere 2.5 billion years ago.

In 1961, a U.S. nuclear bomb was accidentally dropped in North Carolina and nearly detonated.

Fact #767 · Science

In 1983, a Soviet officer refused to report a false missile alert, potentially preventing nuclear war.

Fact #777 · Science

Smilodon is the scientific name for the saber-toothed cat.

Fact #684 · Science

The Moon's surface temperature varies dramatically.

Fact #299 · Science

In 1865, a volcanic eruption in Indonesia affected global weather patterns.

Fact #774 · Science

Energy and mass are interchangeable.

Fact #1973 · Science

Some volcanoes remain dormant for centuries before erupting.

Fact #184 · Science

Electric currents create magnetic fields.

Fact #146 · Science