Dark matter makes up roughly 27% of the universe's mass-energy, but has never been directly detected.

The first birds evolved from small theropod dinosaurs.

Fact #693 · Science

Learning involves changes in neural connections.

Fact #986 · Science

The Hawthorne experiments studied workplace productivity.

Fact #1011 · Science

Time moves slower in gravity.

Fact #1721 · Science

The earliest dinosaurs were relatively small.

Fact #731 · Science

In 1938, Otto Hahn's work led to the discovery of nuclear fission.

Fact #1015 · Science

The discovery of anesthesia allowed painless surgical procedures.

Fact #1230 · Science

The largest dinosaurs were plant-eating sauropods.

Fact #685 · Science