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17 Obvious Things You've Probably Never Thought Of

When it comes to basic facts, what you don't know can hurt you, or at the very least surprise you.

The reason why men have nipples.

The reason why men have nipples.

Have you ever wondered why men have nipples? The answer is simple: every fetus is a female in the uterus until receiving the "Y" chromosome. Once the testosterone hormone kicks in, the cells begin to change in the genitals, but the nipples remain. 

You always see your nose.

You always see your nose.

If you aim your eyes down and concentrate, you can easily spot your own nose. The odd thing is that your eyes always register your nose; you've just blocked it out after several years of getting used to it.

Cell phones are dirtier than toilets.

Cell phones are dirtier than toilets.

Think about how much you rely on your phone and how often your fingers are dancing all over the screen to interact with it. Now add all of your germs to the germs of your friends every time you hand them your smartphone to show them a recent noteworthy photo or status update.

Lol is a real name.

Lol is a real name.

The current generation can't help but think of LOL as an acronym for "laugh out loud." Although not popular for the babies today, Lol actually started out as a name. Who knew?

Tanning can be deadly.

Tanning can be deadly.

Okay, so chances are you already know that getting that ideal "bronze glow" in the summer comes with certain health risks, such as skin cancer. You may not know that especially deep tans are so damaging to your blood vessels that it takes more than a full year for them to recover. This sun damage can also cause your skin to lose elasticity, which eventually results in sagging, wrinkled skin. 

How to burn off a Big Mac meal from McDonald's.

How to burn off a Big Mac meal from McDonald's.

By this point, everyone realizes that McDonald's features certain menu items that are far from healthy. Do the math, though, and you'll discover that you would need to walk 9.5 miles to burn off a Big Mac, an order of large fries, and a Coke.

Peeing in the shower saves water.

Peeing in the shower saves water.

Respectable people would never pee in the shower—or would they? This seemingly uncouth habit actually saves over 1,000 gallons of water a year; just think of all those times you don't have to flush.

People rarely read the terms of service.

People rarely read the terms of service.

You know all those times you find yourself on a website with a lengthy "Terms of Service" page that details every legal consequence of anything you do from that point on? The rest of the world does exactly what you do: click the button that indicates you've read it and move on without batting an eye.

Ostriches are the only birds with bladders.

Ostriches are the only birds with bladders.

Birds are different from people in many, many ways. One very obvious way is that they don't have a urinary bladder. The ostrich is the lone exception—and now you know!

Smoking causes wrinkles.

Smoking causes wrinkles.

The number of smokers worldwide has definitely dwindled over the last several decades, but there are still many people who don't believe that all the "supposed" negative effects actually occur. Smoking really does cause wrinkles; in fact, smokers have as many as 10 times more wrinkles than non-smokers.

The bushes and cloud graphics in "Super Mario Brothers."

The bushes and cloud graphics in "Super Mario Brothers."

If you're a video game enthusiast, or you grew up in the '80s, chances are pretty good that you played "Super Mario Brothers" on the Nintendo Entertainment System at least once. What you should have noticed (but probably didn't) was that the clouds and bushes are the exact same graphic—they're just colored differently.

"Duck Hunt" is a two-player game.

"Duck Hunt" is a two-player game.

While on the subject of the classic Nintendo Entertainment System, "Duck Hunt" was actually not intended to be a single-player game. You may have spent hours firing away at your TV screen trying to shoot that pesky duck without realizing that the second controller could be used by a friend who was directly responsible for its clever maneuvers.

Hydrogen turns into humans.

Hydrogen turns into humans.

What are the building blocks of life? There are six basic elements in a human body, one of which is hydrogen. The process isn't a straight line, but ultimately the presence of hydrogen has the ability to form a human body.

Emilio Estevez is Martin Sheen's son.

Emilio Estevez is Martin Sheen's son.

Before he changed his name, Martin Sheen was actually Ramón Estevez. He had two sons, one of whom changed his name to associate professionally with Martin, while the other kept his original surname. Therefore, Emilio Estevez is Charlie Sheen's brother and Martin Sheen's son.

Half of those people who have reached the age of 65 are still alive.

Half of those people who have reached the age of 65 are still alive.

More people are reaching 65 than ever before in human history. And that's why approximately half of those who have reached that age are still around to brag about it.

Antibiotics don't work as a treatment for viruses.

Antibiotics don't work as a treatment for viruses.

There's no question that antibiotics are a powerful medication, and many lives could have been saved if they had existed since the dawn of human existence. With that being said, antibiotics are essentially worthless when it comes to curing viruses like common colds, coughs, and the flu, as this form of medication is useful mainly for infections. 

Blood is not blue in the body.

Blood is not blue in the body.

There's a common myth that states that blood is red outside the body and blue inside of it. This is not at all true, however. Human blood is always red, and although the shade of red may change, it's never blue or any other color at any point. So don't be fooled by your blue veins!

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