Sink A NeedleScience brain teasers require understanding of the physical or biological world and the laws that govern it.
How can you sink a needle that is floating in a bowl of water without touching it, dropping anything on it, or shaking the bowl?
AnswerDish soap! The molecules in dish soap separate the water molecules from each other, and since the surface tension of the water is no longer as great, the needle sinks!This experiment actually works, the trick is using some sewing thread to lower the needle onto the water. Hide What Next?
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