How to detect good and bad eggs without cracking open

I landed on a Food blog, and this is what caught my attention. Ever wondered how you could detect rotten eggs without cracking open the eggs? Here is a technique she uses when baking especially when she has got to use left over eggs from weeks before. This is to avoid cracking open rotten eggs into a batch of good eggs. Works like magic too... Who is she? - Guys meet my new friend :) - Dobby

Directions:
#Step 1: fill a bowl with cold water
#Step 2: gently add the eggs you are unsure of into the water
#Step 3: Watch for a few minutes, the ones that float are the rotten eggs while the ones that sink are the good eggs.

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