10 interesting and strange questions, do you know the answers to them?

Children are keen to ask all kinds of questions because of lack of knowledge and curiosity. In fact, some questions are quite interesting and meaningful. For adults, we should maintain this curiosity and thirst for knowledge. Let us look at some very interesting and strange questions together:

1. Why do we close our eyes when we eat lemons?

We may have inherited this habit of reflection from our ancestors. Closing our eyes can prevent lemon juice from splashing into our eyes, which can damage the mucosal tissue of the eyes.

2. Why do we have goose bumps?

In fact, goose bumps are a very old phenomenon from animals. Goose bumps come from the shrinkage of pores. In the animal world, this way can quickly warm them up. When in danger, this state of hair can also help the animal look bigger and more threatening in front of the enemy. Humans also get goose bumps in cold weather or extreme emotional states, which are the result of adrenaline subconscious stimulation.

3. Why can't we hear our own voice in the recording?

The simple answer is that our bones have the ability to transmit sound. Our interlocutor can only hear sound through air conduction. This sound was recorded in the recording. But at the same time, our own voices we hear are a mixture of regular sounds and low-frequency sounds conducted through the skull.

4. Why do we get headaches when we drink or eat cold food?

You may have noticed that when eating ice cream, you suddenly feel a headache. You will also encounter this situation when running in cold air and breathing cold air. This is related to the contraction or expansion of the palatine vessels in response to low temperatures.

5. Why does our skin turn black and our hair lighter in the sun?

It is melanin that is responsible for black hair and skin, and in both cases, the sun destroys melanin. The difference is that the hair is dead while the skin is alive. When the melanin is destroyed, the melanin in the hair cannot be regenerated, so its color will become lighter and lighter. The skin will react to the destruction of melanin and produce more melanin, thus making the skin darker.

6. Why does the dirt on our black keyboard look white while the dirt on the white keyboard looks black?

In fact, dirt is usually gray. However, the fine particles of dirt prevent us from seeing its true color. We can only distinguish spots that are slightly brighter or darker than the background color.

7. Why do birds fly in adult zigzags?

Generally speaking, they fly in this way to save energy: birds flying in the front row use their wings to generate a special air flow. Those flying in the back row can use these air streams to save their energy. Secondly, this form allows these birds to see their lead bird at the same time, which is usually the one that flies first.

8. Why does the stream make a gurgling sound?

This kind of sound is the sound produced by air bubbles being caught by the water stream and then bursting suddenly. Bubbles of different sizes produce different sounds, and it sounds like gurgling water.

9. Why is the blood of the ring finger taken during the blood test?

First of all, the thumb and little finger are closely related to the wrist. Once they become infected, they can cause their arms to be implicated. Therefore, in addition to the thumb and little finger, other fingers are suitable for blood tests. Second, the ring finger is the finger that feels the least pain. It works less than other fingers and has a thinner skin. If we don't use that finger often, then the minor injuries left by the blood collection can quickly recover.

10. Where did the waste on the plane go?

We know that the trains are all lined up on the tracks. But on an airplane, when you press the flush toilet button, a pipe will open and waste will be sucked away. These things will be packed into a container until the upper limit of the container is reached. A single such container can hold about 75 liters of waste. When the plane lands, these containers will all be removed.