DNA is so tightly packed in a cell nucleus that if stretched out, each cell's DNA would be about 2 meters long.

The axolotl can regenerate limbs and even parts of its heart.

Fact #366 · Science

Lightning can travel from the ground up into clouds.

Fact #255 · Science

Fossils are formed when remains are preserved in rock over millions of years.

Fact #631 · Science

Handwashing protocols significantly reduced hospital infections.

Fact #1214 · Science

Atoms are made of protons, neutrons, and electrons.

Fact #60 · Science

The smallpox vaccine led to the global eradication of smallpox.

Fact #1197 · Science

Water expands when it freezes, which is why ice floats.

Fact #9 · Science

The use of ultrasound improved prenatal care.

Fact #1213 · Science