5 things can not be explained by science

The existence of ghosts, bigfoot monsters or Déjà Vu sensations are common questions of humans for many years, but still have not been clearly explained by science.

1. Yawn

Yawning is an unconditional and common reflex of humans and many types of animals, with the usual expression of opening wide mouths and exhaling long. This reflex can also "spread" from person to person.

Many ideas are raised around the cause and purpose of yawning in humans, but there seems to be no scientific research in depth. Some hypotheses suggest that yawning can help relieve brain overload or control the temperature of the brain, by increasing the amount of circulating blood that reaches the jaw, neck, and sinuses and then removing heat. from this amount of blood when breathing deeply. However, yawning reflexes are thought to appear less in hot weather, when air is less likely to cool the body.

Artwork: Wikimedia Commons

According to another hypothesis, yawning can be a signal to wake people up and make us more alert. About yawning spread, scientists think this may be a way to show empathy between people. However, another study found the opposite conclusion.

2. Ma

According to a CBS News survey in 2005, 48% of US citizens believe that ghosts exist, in which most women believe this. One in five of those interviewed said they had seen or felt the presence of ghosts.

Modern scientists have never studied this topic in depth, but many controversial assumptions about the devil still exist. Hypodermia, the type of sound that is lower than the human hearing threshold, is thought to interfere with the vision and makes many people think that they see something.

The appearance or existence of ghosts for many people may be due to hallucinations, the effects of carbon monoxide poisoning.

3. Déjà Vu

Déjà vu in French means "seen ". This is a phrase that describes how people feel far away, mysterious and difficult to describe events or images as they have ever seen or seen before. For example, a woman stepped into a building that she had never been before, but felt that the scene was strangely familiar.

The cause of the formation of Déjà vu is still a mystery, although there are many opinions given to explain this phenomenon. Many people believe that Déjà vu is the image of life from previous lives, or related to intuition and psychology of people.

In one study, experts found a healthy man could experience the Déjà vu phenomenon when he took medicine to prevent the flu. Déjà vu may also appear when a person's brain encodes a new memory incorrectly, or does not react when establishing a certain sense of familiarity.

4. Bigfoot

Bigfoot is a creature with many names, for example it is called the Yeti when it is said to appear in the Himalayas, "wild man" in Central Asia or Yowie in Australia. Even so, the true existence of the bigfoot is still a question for the scientific world.

The clear evidence of the bigfoot existence has never been established. Experts have yet to find any evidence of their teeth or bones, but only by telling witnesses and photographs. The assumption is that the bigfoot sight often involves large animals, which can be confusing to people.

The image is said to be Bigfoot monster.(Photo: moviewriternyu.wordpress.com)

5. Placebo effect

Placebo effect, which means "I am happy" , is applied by doctors to influence the psychological factors of the patient, giving them the excitement and confidence to quickly become ill. Counterfeit pills contain only sugar and no pharmacological activity is used in medical research to prove whether the medication is really effective.

However, in practice, this effect may be more confusing than originally expected. According to some recent studies, this method still works when patients are told that they are only taking counterfeit medicines. Another test showed that people who received fake analgesic cream felt less active in the pain sensing area in the brain.

Determining the effectiveness and process of this method to relieve pain, treat wounds or help patients sleep easier, has not been clarified yet.