At first glance, all three eggs in this puzzle look exactly the same—but place them in a glass of water, and one behaves very differently. 🥚 The question is: which egg would you avoid eating? The clue comes from what happens inside an egg as it gets older.

A fresh egg usually sinks to the bottom and lies flat, which is what we see with Egg 1. Egg 2 also sinks, but stands more upright. That generally means it’s older because the air pocket inside the shell has grown. Egg 3, however, floats near the surface. As an egg ages, moisture escapes through tiny pores in the shell, causing its internal air cell to become larger and making the egg more buoyant.

That makes Egg 3 the oldest of the three—and the likely answer if the puzzle asks which one is “bad.” But there’s an important catch many people overlook: a floating egg is not automatically spoiled or unsafe. The water test can give you an idea of an egg’s age, but it cannot determine whether harmful bacteria are present.

If you’re unsure about an older egg, crack it into a separate bowl and check its appearance and smell before using it. A strong rotten or sulfur-like odor is a clear warning to throw it away. 🧠 So the puzzle’s answer is Egg 3, because it has the largest air pocket and is the oldest. But remember: floating tells you about age, not definite spoilage. Did you pick Egg 3? 👀🥚