It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
The average person's skin weighs twice as much as their brain.
131
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
A human being loses an average of 40 to 100 strands of hair a day.
133
Your thumb is about the same size as your nose.
124
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118