Most of us like to assume that we have a pretty good understanding of the objects we use and interact with every day.

But did you know some very common items have secret uses that most people never even realize?

A surprising number of everyday objects have incredibly interesting hidden features and unexpected origins that most of us totally miss.

From escalator brushes to barber poles, let's check out some amazing secrets hidden in everyday

things.

You're listening.

You're listening.

Be amazed.

Whether it's pennies or $100 bills, most people come into contact with money every day.

But almost all currencies have their hidden secrets.

Take the dollar bill, for example.

For starters, the big letter on the front that may have piqued your curiosity on occasion is used to denote which Federal Reserve

Bank was responsible for printing that note. The L corresponds to the Federal Reserve of San Francisco,

while the H tells you it was printed in St. Louis. Flipping the note over, it's not surprising the

simple rich backside of the dollar has a few secrets. Firstly, I'm sorry to say

the eye in the triangle isn't the Illuminati's calling card. It's actually a traditional Christian icon

representing the all-seeing eye of God, encased in the three sides of the Holy Trinity.

The eagle, meanwhile, can be seen holding 13 arrows in a branch with 13 leaves.

These represent the original 13 states of the USA, United Under One Nation. Now, have you ever

wondered why notebooks and books in general have margins? You might assume notebook margins are

just useful guides for writing neatly and, of course, doodling.

But they originally served an even more important function. In medieval times, when rodents were a real

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