What Bodily Fluid Can Change Depending On Emotions? Blood Saliva Tears Urine Did You Know! Your Liver Can Regrow Itself—Even If 75% Is Removed The liver is the only internal…

Which Of These Body Parts Has Its Own Immune System? Eyes Ears Kidneys Tongue Did You Know! Your Brain “Deletes” Information While You Sleep Deep sleep doesn’t just rest your…

What Organ Produces The Most Heat In The Body? Heart Liver Brain Muscles Did You Know! Some People Hear Colors and Taste Words (Literally)This rare phenomenon is called synesthesia. In…

What Causes Your Fingers To Wrinkle In Water? Water absorption Skin expansion Nervous system reaction Blood pressure change Did You Know! Your Brain Can “Predict the Future” in Microseconds Before…

What Animal Has Fingerprints Similar To Humans? Monkeys Bears Koalas Rats Did You Know! Rabies Can Cause Fear of Water—Literally One of the strangest symptoms of rabies in humans is…

What Internal Body Part Is Naturally Blue In Color? Veins Lungs Spleen Gallbladder Did You Know! Some Cancers Can Be Contagious—But Not in Humans (Usually) There are a few known…

What Weird Fact Is True About Human Bones? Melt at high temperatures Stronger than concrete Can grow teeth Contain iron Did You Know! Leprosy Can Suppress Pain—Permanently Leprosy (Hansen’s disease)…

What Causes Your Stomach To "Growl" When You're Hungry? Acid secretion Gas buildup Intestinal contractions Liver activity Did You Know! The liver can regrow itself — and pretty fast. Fact:…

Which Ancient Civilization Used Crushed Mouse Brains As Toothpaste? Greeks Chinese Egyptians Romans Did You Know! The stomach gets a new lining every few days — or it would digest…