Eggs that float in water are generally older and may be less fresh, but floating does not necessarily mean the eggs are bad or unsafe to eat. As eggs age, moisture inside evaporates and is replaced by air, making the egg less dense and more buoyant. A floating egg may still be safe to eat if it does not have a foul smell or unusual appearance when cracked open. To be sure, one should crack the egg into a bowl and check for a bad odor or discoloration before deciding whether to consume it.