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

The strongest muscle relative to its size is the masseter (jaw muscle)

Masseter: Strongest muscle by size, vital for mastication

The footprints on the Moon will last millions of years — there's no wind or water to erode them

Moon's lack of atmosphere and liquid water preserves footprints indefinitely

Mandarin Chinese is the most spoken first language — about 920 million native speakers

Mandarin Chinese has approximately 920 million native speakers

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

"One teaspoon of soil hosts more microbes than Earth's human population."

The mantis shrimp can punch at 50 mph — accelerating faster than a .22 caliber bullet

Mantis shrimp's punch speed exceeds .22 caliber bullet's velocity

Sharks are older than trees — sharks appeared about 400 million years ago, trees about 350 million

Sharks existed approximately 400 million years ago, predating trees by 50 million years