At school you learn to solve mathematical problems and to know geographical boundaries, for example. From there it goes through Chemistry, Physics, Biology, Sociology, Physical Education, Arts, Portuguese Language and so on. There is not, however, a discipline called "Life, " which would have a menu intended to say the right way to do all things.

Good thing, in fact, that there is no such thing. So theoretically we can make our choices, our hits and misses. And that's precisely why, because we always do things our way, some of them are done the wrong way by most people. Doubt? Check out some examples below:

1 - Lathering body parts

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If you think “the more foam the better”, know that this logic is not valid. Soaps and detergents contain chemical agents - surfactants - that help remove dirt from your skin. Foam is the result of the action of these agents with your body oil, dead cells and bacteria that you will send down the drain. So you don't have to use a lot of soap to make a lot of foam. This is just a waste.

2 - Giving birth

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Only those who are mothers know and only those who are women can imagine the pain of childbirth. The fact is that having a child lying down is not the best position for the mother, even though it has become the most common in many countries. Some studies indicate that the idea of ​​making the woman lie down at the time of having a baby was King Louis XIV, who liked to see childbirth and would have ordered the women to lie down so that he could see everything better.

Then the position made it conventional by the comfort given to all those involved in childbirth - except the mother. The best way to have a child is by knee or squatting, as gravity will help, and the mother will need to push less.

3 - Use hairpins

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The item so common is present in the beauty kit of those who want to keep the hair tight. Now answer us: is the wavy part of the hairpin in or out of the hair?

Most people would say the ripple part is outside, right? What not everyone knows, though, is that this is the part that should be facing your scalp - so your hairstyle will get even firmer. Save this tip, huh!

4 - Number Two

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Meeting our sitting needs is not a good idea, you know? That alone is enough to make you more likely to develop diseases like hemorrhoids and cancer.

Our nature has made us ideal for squatting when defecating. The toilet as we know it is a creation that is on average 200 years old, which is very, very little. Experts recommend using a footstool, as squatting is difficult when you think about current toilet models.

5 - Having sex

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As well? Are we having sex the wrong way? It's possible? Well, before you throw us stones, it's not like that. Sex is on the list for a more animal reason, so to speak.

Do you know, for example, why the size of today's man's penis is larger than that of men of old? It all started with the change in posture: when we started walking with two legs and keeping the spine erect, the female body underwent changes in her genital area, making the penis get bigger and hit its "target".

Another curiosity: men have always been attracted to women's buttocks, as this part of the female anatomy has always been seen as indicative of health and availability. That's why seeing a woman from behind makes a man excited - it's instinctive.

When the sexual act has already begun, the same position is known to give the woman great pleasure. Scientists say that this would therefore be the best position, the most "correct" one. It will be?

* Originally posted on 12/3/2013.