Which Organ Contains Approximately 100 Billion Nerve Cells? Brain Spinal Cord Heart Eyes Did You Know! Some People Can Recognize Objects but Not Faces A rare brain disorder called prosopagnosia,…

Which Body Part Grows Faster Than Almost Any Other Tissue? Hair Follicles Bone Skin Tendons Did You Know! Some People Believe They Are Dead A rare psychiatric condition known as…

Which Body Part Has The Highest Concentration Of Sweat Glands? Hands and Feet Forehead Armpits Back Did You Know! Some People Cannot Feel Physical Pain A rare genetic disorder called…

What's The Strongest Substance Made By The Body? Bone Cartilage Tooth Enamel Fingernails Did You Know! Your Immune System Can Attack Your Sleeping Muscles A rare neurological disorder called Stiff-Person…

Which Organ Can Survive The Longest Without Oxygen? Heart Kidney Brain Skin Did You Know! A Rare Disorder Can Make People Believe They Are Dead Cotard’s Syndrome is an extremely…

Which Human Body Part Contains No Muscles? Eyeball Nose Ear Lips Did You Know! A Sleep Disorder Can Cause People to Act Out Their Dreams People with REM Sleep Behavior…

What Is The Fastest-Growing Tissue In The Human Body? Bone Marrow Hair Fingernails Intestinal Lining Did You Know! Some People Are Allergic to Water A rare condition called Aquagenic Urticaria…

Which Body Part Receives Oxygen Directly From The Air Instead Of Through Blood? Retina Cornea Eardrum Tongue Did You Know! A genetic disorder can affect only a tiny percentage of…

Which Organ Can Actually Shrink When You Lose Weight? Liver Brain Spleen Thyroid Did You Know! Not all genetic disorders are inherited from parents. Many genetic conditions result from “de…