Gene flow between populations is constant throughout human history — there are no pure or isolated human groups.

The use of antibiotics reduced deaths from bacterial infections.

Fact #1220 · Science

The Earth's inner core is primarily iron and nickel.

Fact #150 · Science

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

Fact #338 · Science

Positive reinforcement can strengthen certain behaviors.

Fact #964 · Science

The Earth's core is extremely hot and under immense pressure.

Fact #88 · Science

Time moves slower in stronger gravitational fields.

Fact #1821 · Science

Vaccination campaigns have eliminated several diseases in many regions.

Fact #1224 · Science

In 1924, a scientist attempted to transmit sound to plants to study their response.

Fact #993 · Science