The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
476
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
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
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Lobsters have blue blood.
476
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
10 seconds is the amount of time until unconsciousness after the loss of blood supply to the brain.
108
Consumption of TNT turns urine amber or deep red, which people often mistake for blood.
301