Decode everyday science mysteries

Many of us have long mistakenly believed in some incorrect scientific or folklore concepts. Are you confident with your common scientific knowledge? Let's go back offline.

Science explains everyday mysteries

What types of acids will burn your skin and distort your body?

In fact there are hundreds of different types of acids, but most of them are not strong enough to damage human skin. Common acids such as vinegar or citric acid are very weak acids that we still consume through everyday foods. Only certain types of acids that have corrosive properties such as hydrochloric acid, nitric acid or sulfuric acid are quite dangerous because they will cause serious skin damage when exposed.

Can brain cells not regenerate or recover?

Scientists have long assumed that complex brain functions will be affected if it produces new cells on its own. However, in 1998, they discovered the opposite. Neurological centers that store memory and receive knowledge still have the ability to produce new cells . Another good news is that scientists have also found a process of making copies of human embryonic stem cells that can transform themselves into nerve cells. In the picture is a form of brain cell simulation

Lightning never hit 2 times in the same place?

The reality has proved the opposite. High-rise buildings each year are hit by lightning less than ten times. Normal or ' priority ' lightning strikes high-rise buildings and large trees, and on the drums they tend to hit several times on any object that rises highest before moving to another target.

Half of the moon is always dark?

In fact, the entire Moon will be illuminated by the Sun at different times. But it is true that there is a part of the Moon that we never observed from Earth. The reason is that the tidal locking phenomenon causes the Moon to have a rotation period exactly equal to the cycle around the Earth, so it always points towards the Earth. But this does not mean that the other side of it is always dark. When we see the moon , it means that at this time the sun is shining a lot on the half that we cannot see.

Evolution means to be better, or go from lower to higher levels?

Although natural selection often removes less effective genes, there is the fact that less perfect individuals overcome this challenge.Mosses, fungi, and sharks and shrimps are among the species that have remained virtually unchanged for a long time. Some other species have changed, but not in a better way. Some changes appear to be irrelevant due to the rapidly changing living environment, so adapting to the new environment does not mean that a species moves up the evolutionary ladder .

People will be exploded in a vacuum in space?

This idea comes from science fiction films , not from reality. People can absolutely exist in space, as long as they have inhaled the air. This will prevent the lungs from breaking, causing air to enter the blood vessels. If there is a lack of air, the first person will lose consciousness, and then die from asphyxia. So astronaut suits are important because they provide astronauts with oxygen in a vacuum.

What kinds of synthetic chemicals are dangerous?

The fact that many artificial chemicals also have identical ingredients to the same chemicals in nature, even more natural substances are more toxic than those synthesized from laboratories. For example, cyanide is a natural chemical, and at a dose of 10,000 mcg it will be deadly. Botulism is also a naturally occurring substance, and only a small amount of one sip is enough to erase half of a city's population. Some common tree species also contain dangerous toxins. In contrast, most pharmaceuticals are synthetic chemicals, and obviously they help prolong our lifespan.