FILE 001Body2–3 million red blood cells every secondBone marrow releases about 2–3 million red blood cells every second into circulation.SrcNCBI — Blood Groups and Red Cell AntigensPass the claimOpen file
FILE 002BodySharehiccupsThe diaphragm is the main muscle of breathing — and sudden spasms of it cause hiccups.SrcNCBI StatPearls — Anatomy, Thorax, Diaphragm
FILE 003BodySharered blood cellsThe spleen filters blood in its red pulp — trapping and recycling aging or damaged red blood cells.SrcNCBI StatPearls — Physiology, Spleen
FILE 004BodyShare120 daysHealthy red blood cells circulate for up to about 120 days before the spleen and liver clear them.SrcNCBI — Blood Groups and Red Cell Antigens
FILE 005BodyShareall five tastes everywhereThe tongue taste map is a myth — you can sense all five tastes everywhere on the tongue.SrcNCBI InformedHealth
FILE 006BodyShareno photoreceptorsEach eye has a blind spot where the optic disc has no photoreceptors.SrcNCBI Neuroscience
FILE 007BodyShare3.47 mm per monthFingernails grow about 3.47 mm per month — over twice as fast as toenails at 1.62 mm.SrcYaemsiri et al., JEADV
FILE 008BodyShare3 to 4 liters of gastric juiceYour stomach makes about 3 to 4 liters of gastric juice every day.SrcNCBI InformedHealth
FILE 009BodyShare0.5 to 1.5 liters of salivaHealthy adults produce about 0.5 to 1.5 liters of saliva each day.SrcNCBI StatPearls
FILE 010BodyShare300 bonesA baby is born with about 300 bones that fuse to form the 206 bones adults have.SrcNIAMS (NIH)
FILE 011Body🦷Sharetrue chinModern humans are the only mammals with a true chin.SrcSchwartz & Tattersall, Journal of Human Evolution
FILE 012Body💧Sharebasal, reflex, and emotionalYour eyes make three kinds of tears: basal, reflex, and emotional.SrcAmerican Academy of Ophthalmology
FILE 013Body👁️Share92 million rods and 4.6 million conesAn average human retina has about 92 million rods and 4.6 million cones.SrcCurcio et al., Journal of Comparative Neurology
FILE 014Body🧬Sharedo not share identical fingerprintsIdentical twins do not share identical fingerprints — ridge detail is shaped by conditions in the womb, so even monozygotic twins remain distinguishable.SrcNational Institute of Justice / Journal of Forensic Identification
FILE 015Body🦴Sharedoes not connect to any other boneThe hyoid bone in your throat is the only bone in the human body that does not connect to any other bone — ligaments and muscles hold it in place.SrcCleveland Clinic
FILE 016Body👀Shareno blood vesselsYour cornea has no blood vessels — it stays clear by taking oxygen from the air (via tears) and nutrients from the aqueous humor behind it.SrcNCBI StatPearls — Cornea anatomy
FILE 017Body🧠Shareno pain receptorsYour brain can't feel pain — it has no pain receptors. Surgeons can operate on the brain while the patient is awake.SrcUCSF Brain Tumor Center