The mantis shrimp can punch at 50 mph

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

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

Skeletal muscle

Masseter muscle: Strongest muscle relative to size

Concrete

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

Vehicle registration plates of California

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

Octopuses have three hearts, blue blood, and nine brains

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

Boric acid

Stomach acid (pH 1.5-3.5) dissolves metal; lining regenerates every 3-4 days