150+ Objects with Hidden Purpose Even Your Parents Don't Know

We see those objects every day, use them daily, but we have no idea that they have those tiny details for some purpose. For example, why do coins have those ridges on the side? Why is the neck of a bottle so long? What do escalators have those brushes for? 

One of those curious objects is your measuring tape. Have you ever noticed that is has a serrated edge? There's a good reason for it: if you're measuring something and don't have any marking tool with you - the serrated edge may come handy!
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