Any knowledge that is accepted by most people as true and that they don’t feel the need to check its authenticity is called common knowledge. Information such as women don’t pee through their vagina or feeding bread to ducks is harmful to them should be common knowledge. But surprisingly, not many people know about it. Here we have brought together 10 such facts that should be common knowledge, yet surprisingly, not many people know about them.

1 People usually believe that the term “third world country” is linked with poverty. But the truth is that it simply refers to countries that did not align with either the US bloc or the Soviet bloc after WW2.

While reading or discussing the “Third World” issue, we usually associate them with countries considered poverty-stricken. But it is not the case. The term Third World is based on an outdated model of the geopolitical world at the time of cold war. The countries aligned with the US bloc were called First World while the countries with Russian bloc were called Second World. On the other hand, the term Third World includes communist (e.g., North Korea) countries as well as very rich (e.g., Saudi Arabia) and very poor (e.g., Mali) countries. Thus, the Third World can be roughly described as those countries who didn’t align with either the US bloc or the Soviet bloc after World War II.(source)

2  If the sun or somebody’s high beams are blinding you from behind then you can switch your rear view mirror to “night mode”.

Sometimes, while driving at night, we find our vision compromised by crude high beams from someone driving behind us. It can also happen during the daytime due to sun’s glare. To avoid getting blinded in such situations, we can switch our rear view mirror in night mode. In your car, you will find a little tab under the rear view mirror. Flick it and a ghost image will appear which will reduce the glare.(source)

3 Women don’t pee from their vagina. They pee through their urethra, and both urethra and vagina are completely separate holes.

In our anatomy class, we are all taught that both male and female pee through the urethra. While growing up, we usually consider vagina and urethra to be same, which leads us to believe that women pee through their vagina.

But women’s anatomy is a bit complex than male. Men have a single opening at the tip of their penis from where they pee and ejaculate. But for women both these actions are performed through two different orifices. Hence, they have three holes down there instead of the usually believed two. These three orifices are urethra, vagina, and anus.  The urethra is located between the clitoris and the vaginal opening.(source)

4 A close look at your keyboard will reveal bumps on the keys ‘F’ and ‘J’. They are there so that you know where to put your fingers without looking down.

When we type using our keyboard, the fingers of our left hand rest on the keys A, S, D, and F and the fingers of our right hand rest on J, K, L, and colon. To guide the index fingers of both hands on the correct keys, there are two bumps on the keys F and J. This helps the users place their hands in the optimum typing position.(source)

5 Plugging earbuds/headphones іn the microphone jack will make them function as microphones.

Believe it or not, earbuds/headphones function as microphones when plugged into the microphone jack. Wondering how? Well, the internal structure of a speaker and microphone is same. So, if you connect the headphones into a microphone jack and speak into it, the diaphragm of the driver of the headphones is moved by the molecules of air that make up a sound wave. This driver is attached to a coil of wire (voice coil) which rests between a magnet. As the coil moves through the magnetic field, a current is produced.

So, the next time you are in a rush and don’t really care about the quality, plug in your headphone into the microphone jack and use it as a microphone.(source)