You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
There are about 1,400 different species of bacteria in your belly button.
10
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Your thumb is about the same size as your nose.
124
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99