String theory proposes that all fundamental particles are vibrating strings of energy in 10 or 11 dimensions.

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

Fact #150 · Science

The first reptiles evolved from amphibian-like ancestors.

Fact #706 · Science

Many coins are made of precious metals such as gold and silver which makes their value higher than face value.

Fact #1672 · Science

Time moves slower in stronger gravitational fields.

Fact #1755 · Science

The Harlow monkey experiments studied attachment and maternal bonding.

Fact #996 · Science

The human brain operates on about 20 watts of power.

Fact #1795 · Science

Antifreeze proteins allow Antarctic fish to avoid ice crystal formation.

Fact #872 · Science

The first birds evolved from small theropod dinosaurs.

Fact #693 · Science