It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Mosquitoes don't just bite you, they also pee on you.
11
Your body is creating and killing about 2.4 million red blood cells per second.
17
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Your heart will pump about 212 million liters in its lifetime.
26