Skeletal muscle

Concrete

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

The mantis shrimp can punch at 50 mph

Mantis shrimp punch at 50 mph, faster than .22 bullet

List of common misconceptions about science, technology, and mathematics

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

Your body has about 37.2 trillion cells

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

Octopuses have three hearts, blue blood, and nine brains

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

Vehicle registration plates of California

Blue whale's heart is the size of a small car