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

How does the unique circulatory system of birds, including the avian respiratory system and air sacs, contribute to their high-altitude flight capabilities?

Birds' efficient oxygen-exchange system and air sacs enable sustained high-altitude flight by maximizing oxygen uptake and minimizing energy expenditure

There are more possible arrangements of a deck of cards than atoms on Earth — 52! ≈ 8 × 10^67

Card arrangements vastly exceed Earth's atoms: 52! ≈ 8 × 10^67

Corneas are the only body parts with no blood supply — they get oxygen directly from the air

Corneas receive oxygen via diffusion from the tear film and surrounding tissues

The human nose can detect about 1 trillion different scents

The human nose can distinguish approximately 1 trillion unique odors

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

Crows can recognize individual human faces and hold grudges for years

Crows exhibit facial recognition and long-term memory of humans