The things that we use every day become such a huge part of our routines that we seldom notice their simplest features. However, look carefully and you may notice that your favorite items have been designed to do much more than you thought. For example, those blue bristles on your toothbrush actually make sense. They gradually lose their color over time. When the blue’s faded, it’s time to change your toothbrush.

Did you know that notebook margins aren’t for taking extra notes or practicing emojis? They were invented to protect people’s work. People used to live with a lot of hungry rats around. The rats would nibble at the paper, eating people’s work! They put the margin lines there to let people know to start their writing further from the edge, so it's not lost to a hungry rodent! Interested? Then check out other cool facts about items with hidden uses. We've found a lot of day-to-day things that have always had some amazing secret features that we probably never knew about.

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