More Body Facts

The human brain uses as much power as a 10-watt light bulb.
The word “organ” comes from an old Greek word, organon, which means “tool” or “instrument.”
There are so many nerve cells in a human brain that it would take almost 3,000 years to count them.
An adult’s skin weighs between 8 and 11 pounds (3.6 to 5 kg). Its surface area is about 18-22 square feet (1.7 to 2 sq. m).
The longest bone in an adult human is the thighbone, measuring about 18 inches (46 cm). The shortest bone is in the ear and is just 0.1 inches (.25 cm) long, which is shorter than a grain of rice.