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Why does an egg have a yolk?
Unlike us, birds form outside of their mother's womb. In a fertilized egg, the yolk is home to the developing bird....

Why does the inside of my mouth feel colder after I eat minty candies like peppermint Lifesavers?
That feeling of coolness isn't just in your mind; in fact, you're going mental over menthol--a powerful essential oil...

Why is white chocolate white?
White chocolate contains cocoa butter, milk solids, sugar, and vanilla; everything but "chocolate liquor," the thick...

Why does an egg soften in vinegar?
The eggshell is made of calcium carbonate. Vinegar contains 5% acetic acid, and that is what dissolves the eggshell....

Why doesn't chewing gum stick to your teeth?
Your teeth are wet and slick. Then you get the gum all wet and slipperly with saliva. In this state, the two don't...

Why is a banana a fruit? Where are the seeds?
A fruit is the ripened ovary of a plant, and it holds the plant's seeds. Fruits grow from a plant's flowers, and...

Why when I drink o.j. after brushing my teeth, does it tastes yucky?
I'm told that one of the secret ingredients in toothpaste is a small amount of one particular chemical that helps...

Why do I get sleepy after Thanksgiving dinner?
Sometimes people blame that after-dinner drowsiness on the turkey. Turkey meat contains an amino acid called...

Why are eggs egg-shaped?
This question seems like a tough one to crack, but scientists have one very sensible theory: the ovoid shape gives an...

What is the difference between a vegetable and a fruit?
A fruit is generally defined by the sweet pulp that surrounds its seeds (oranges, apples, mangoes), while a vegetable...

Why does cutting onions make you cry?
When you cut into an onion, a powerful acid sprays up into the air. If your eyes are in the way of the spray (which...

Why does the skin of a banana turn brown when I leave it outside?
Bananas turn brown when left outside after a while because certain chemicals in the fruit react with the oxygen in...

Does gum really take 7 years to digest in your stomach?
Nope, that's just a myth. In fact, our stomach doesn't digest gum at all! Since it's made out of soluble fiber,...

What is Jello made of?
Jell-O consists of four main ingredients: gelatin, water, artificial sweetener, and food coloring. Gelatin gives...

Why does lemon juice prevent cut apples from turning brown and vinegar doesn't?
Cut apples turn brown because of a reaction called oxidation. Oxygen in the air reacts with a natural substance...