ScienceWeirdIt would take about 1,200,000 mosquitoes to fully drain the average human body of blood.2762k
BodyDark10 seconds is the amount of time until unconsciousness after the loss of blood supply to the brain.1671k
BodyInterestingUnconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.1311k
BodyInterestingThe average adult human body contains about 3 to 5 grams of iron, which is enough to make a small nail, though this iron is not in metallic form but integrated into biological molecules.631k
BodyWeirdYou can hear the blood flowing through your ears if you find a quiet place and cover them tightly.221k
AnimalsMind-BlowingAt one 'feeding', a mosquito can absorb one and a half times its own weight in blood.15941
AnimalsWeirdIf 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.122k
TechnologyInterestingScientists in the UK developed a smartphone dongle that could test for STIs including HIV and syphilis in just 15 minutes, using a small blood sample and delivering results directly to the phone.41k
PlacesWholesomeIn Sweden, blood donors receive a text message whenever their blood is used to save someone's life.11