Which Animal's Organ Do Surgeons Study To Better Understand Human Heart Valves? Cow Sheep Goat Pig Did You Know! Your kidneys make their own “internal weather system.” Inside each kidney,…

What Surprising Thing Increases Your Pain Tolerance? Listening to sad music Holding someone’s hand Smelling lemons Wearing sunglasses Did You Know! Inside each cell, proteins are constantly “shape-shifting” thousands of…

What Food Can Temporarily Turn Your Bones Slightly Pink? Blueberries Carrots Red apples Beets Did You Know! Some of your cells are older than your bones — and nearly as…

What Unusual Body Part Can “Remember” Past Infections? Your liver Your skin Your bones Your pancreas Did You Know! Your cells glow in the dark — but the light is…

How Long Does It Take For Your Entire Body To Replace Every Cell? 1 year 7 years 10 years 20 years Did You Know! Your lungs are covered in “taste…

What Drink Was Originally Invented As Medicine? Coca-Cola Root beer Lemonade Pepsi Did You Know! Your brain uses electricity — but it can power a small light bulb. The human…

Shivering Burns Calories Because Of What? Generates heat Raises blood sugar Lowers your heart rate Expands blood vessels Did You Know! Your bones are constantly glowing — you just can’t…

How Many Muscles Does It Take To Take A Single Step? 25 100 200 400 Did You Know! Your Skin Has Built-In “Night Vision” Molecules Inside the skin are light-sensitive…

Humans And Elephants Share A Unique Trait, What Is It? Gray hair Emotional tears Mourning their dead Wrinkled skin Did You Know! You Shed Enough Skin Cells Each Month to…