The Riemann Hypothesis, proposed in 1859, remains one of mathematics' most important unsolved problems.

The use of microscopes improved understanding of pathogens.

Fact #1231 · Science

There are invisible colors humans cannot see.

Fact #1710 · Science

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

Fact #1189 · Science

Volcanic eruptions can release ash clouds that disrupt air travel.

Fact #811 · Science

The discovery of Helicobacter pylori changed treatment for ulcers.

Fact #1215 · Science

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

Fact #234 · Science

Early dinosaurs were bipedal.

Fact #749 · Science

Time moves more slowly in stronger gravitational fields.

Fact #1618 · Science