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9 Common things whose true purpose you didn’t know

We are really surrounded by lots of objects in our daily lives that seems so common we don’t even stop to think why they are really needed and how they appeared. Today I will enlighten you and tell you about the extra ordinary purposes of the most ordinary things.

Stickers on fruit

They mark the country and the producer, but few we know what the numbers on the stickers we mean. If there are 4 digits and the first is 4, it means that the fruit has been sprayed with pesticides, 5 digits and the first is 9, the fruit has been grown organically, and if it starts with 8, the fruit has been genetically modified.

The utility knife is more complex than you thought

It becomes easy to sharpen this knife, take the end cap of, bleak the blunt blade off with it, and then use the slider to bring the sharp blade to the front.


It means that the preceding trademark is officially registered with the US Patent and Trademark Office. The registration gives the trademark owner not just the right use of R on their products but also sue anyone who tries to infringe on the trademark.

Ridged edge of coins

They first appeared on coins in the early 16th century, at that time people would cut off small amount of precious metal from the coin and sell, then they’d pass on the damaged coin at full value. A special method called reeding was introduced to counter for that practice. Consisted of carving a series of grooves on the edge of the coin which made it easy to see if the coin have been tampered with.

Stripes on headphones jacks

All headphone jacks have 2 or 3 stripes on them, they aren’t made for decoration, there are wires going to the both headphones from every stripe, and if they weren’t there, you would only hear sound coming from one of the headphones.

Holes in padlocks

Padlocks are often used to lock doors and gates outside, this makes them get out of order because of rain, when that happens, some buy new locks, but there is no need, because the purpose of the small holes at the bottom is to pour engine oil inside, after that they will turn in the lock without any difficulty.

Dimples on golf balls

The first golf balls were smooth, but with time the golf players realized by trial and error that the balls with the best properties were old, scuffed and cracked ones, so they kept using the old ones. When manufacturers noticed this tendency they started producing artificially aged dimples balls.


Many people think that they were made to prevent sun rays, but actually, dark glasses were invented by Arctic people as a means of protecting their eyes from dazzling snow.

Content created and supplied by: NastieEddie (via Opera News )

R US Patent and Trademark Office


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