Have you ever noticed, when looking at the finger for a long time, will turn like an alien finger? It is normal you see turn into things that look very strange.

The same applies to the behavior. For example, when there is something funny, people laugh. Selaini tu man spent a third day in a condition known as dead or asleep. Ponder these behaviors, you will find it very strange. Here are 10 things that ordinary people have always done strange and the reason people do it.

Cry
Grief can make tears fall. Among all creatures, only man who can weep with emotion. Not only useful to communicate feelings, scientists believe there is an unwanted hormones in tears and other proteins produced during stress masses. This kind of effect is called 'good cry'.

Hiccup
Hiccups are spasms forced the diaphragm (the membrane of the chest muscles to breathe). This makes the muscle spasm due to irritation or the least amount of food in the stomach. Strangely, hiccups do not have goals. One hypothesis states, hiccups are the remnants of primitive sucking reflex.

Sleep
Humans spend a third time to sleep. No one can get through the day without sleep. This is the only behavior that could be understood. Sleep allows the 'maintenance' of chemical production for up to brain development. Some theories suggest, sleep is important for memory and learning. Sleep also helps put into episodic memory 'storage medium' long-term.

Death
Technically, death is not everyday activities. However, death occurs in many people at once each day. Why? Humans die because of cell death. Although the cells continue to be updated for 70 years, the cells can not renew itself forever. In cells contained telomeres to store genetic information. However, over time, telomeres are not capable of storing information and the cell can not divide again.

Viewing in 3D
How can the human eye can produce a 3D vision? It is actually a mind trick. The human brain utilizing 'binocular disparity' in order to see a different picture from the left and right eye. In addition, using the picture, the human brain reconstructs the depth.

For close objects, the brain is registering 'convergence' of the human eye to determine how far the distance. When looking at anything that moves, distance unconsciously it raises 'parallax' which at different speeds, the object will look closer or away.

Embarrassed
Flushed cheeks blushed make. This reaction is common in humans as social attention. Blushing can be induced to meet important people, received praise and experiencing strong emotions in social situations. Biology blushed working with expanding areas of blood vessels to face flushing effect. However, until now, scientists did not understand what the function of blushing.

Kiss
Biological instinct is indeed seem strange. Kiss lets people use smell and taste in order to assess their partner. Breath and saliva someone save a bookmark chemical signals healthy or sick. Furthermore, the skin on the nose and mouth covered with oil containing pheromones, chemical, biological makeup of men.

When he gets a pheromone during the kiss, unconsciously, people are becoming increasingly interested or not interested in sex. Psychologists believe, physical action to help the couple kiss 'acquainted'.

Fart
Each food and drink, the gas enters the body. In fact, a normal fart 1.9 liters or about 15-20 'tut' every day. Fart special aroma comes from the stomach bacterium. When processing food into nutrients in the gut, the microbes produce hydrogen sulfide odor (rotten egg gas similar). Like humans, the bacteria are very fond of sweet foods. This type of natural sugar in milk and fruit become contributors 'tut' ever.

Laugh
When there is something funny, laughter is always the urge arise. Laughter is strange. Why do humans laugh? Psychologists believe this behavior is a response to signal to others through the dissemination of positive emotions, reduce stress and the contribution of cohesion. It is also common in primates, chimpanzees and orang-utans as well laugh while playing.

Blink
Blinking is not a strange thing. Tenth of a second activity is to remove particles of dust and spread the lubricating fluid into the eyeball. It is strange, people always could not 'see' the darkness in aktivtas 2-10 seconds. Scientists found that the human brain has the talent while ignoring the dark. Blinking suppresses the activity of several brain areas responsible for detecting environmental changes. As a result, humans can perceive the world in sustainability.