Blood vessel

Octopuses have three hearts, blue blood, and nine brains

Octopuses have three hearts, blue blood, and nine brains — one central, eight in their arms

Your body has about 37.2 trillion cells

"Your body contains approximately 37.2 trillion cells, surpassing the Milky Way's stars."

Contact lens

Why can you see clearly up close and far away with just your eyes?

Concrete

Human bones are stronger than concrete — ounce for ounce, bone is stronger than steel

A single teaspoon of soil contains more microorganisms than people on Earth

A teaspoon of soil harbors more microorganisms than Earth's human population

List of common misconceptions about science, technology, and mathematics

"Brain uses 20% body energy, 2% body weight."