Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
22
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
Your body is creating and killing about 2.4 million red blood cells per second.
17
Mosquitoes don't just bite you, they also pee on you.
11
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
10 seconds is the amount of time until unconsciousness after the loss of blood supply to the brain.
108