Oxygen is the most common element in the human body, making up almost 63% of the average human, followed by carbon (19.37%), hydrogen (9.31%), and nitrogen (5.14%).

Many plants and animals are capable of producing visible light. The scientific term for this phenomenon is bioluminescence.

Unlike most other fish, a shark has no bones! Its skeleton is made of cartilage, a material somewhat softer and more flexible than bone.

Your kidneys filter fifty gallons of blood every day, producing about 1.5 liters of urine!

The explorer David Livingstone described the baobab as having an upside-down appearance because of its massive trunk which can attain a circumference of more than 82 feet and store up to 32,000 gallons (120,000 litres) of water to endure harsh drought conditions.

The Flu killed 43,000 American servicemen mobilized for World War I, representing nearly 40 percent of U. S. military casualties.

Insect respiration is accomplished without lungs. In most cases, air is taken in through openings on the sides of the abdomen and thorax called spiracles and transported directly to tissue cells using tracheal tubes.

Sperm Whales have the heaviest brain of any living animal. The average Sperm Whale's brain weighs more than 20 pounds (9 kilograms) which is about 4 times heavier than the average human brain.

Atavism is an apparent "throwback" characteristic of an organism that reveals a trait of an earlier ancestor. Examples of atavism include hind legs on whales, teech in chickens, and color blindness in humans.

A baby has more bones. As they grow, some of their bones fuse together.