The brain is one of the most important and complex devices in the universe, some scientists say it has 10 billion neurons. Other scientists say it contains 100 billion cells, and if we connect the ends of brain cells to each other to become a thread from land to the moon.
Scientists say that the human brain evolved and increased in size with the evolution of life and challenges, and distinguished from the rest of the brains of other organisms with the layer of NewCortex, which makes up fifty percent of the brain mass, and its function enables the human to implement ideas.
Neuroscientists say the brain contains complex circuits of billions of neurons. Unlike the computer, the brain is made up of thousands of cells that are different in form and components, which are connected and distributed in several areas of the brain.

Brain parts
1- Brain: is located in the upper part of the brain. It contains a meandering called brain deflation, the most complex and sensitive part of the brain, gray. It is responsible for remembering, understanding, questioning, and intelligence.
2- The cerebellum is the smallest part of the brain, spherical, located in the lower part of the brain. It contains half the number of neurons in the brain. Its function is body balance, reflexes, and regulation of motor functions.
3- The brain stem is a brain block that connects the brain with its three parts. The rectum's function is transmitting nerve commands across the rectum from the brain to the rest of the body. It also transmits sensory information from the body to the brain. It contains breathing centers, awareness and pain.

Electroencephalography (EEG) is known as a medical test to detect the electrical activity of the brain by connecting a number of electrodes to the scalp. it is responsible for sensing and recording electrical waves from the brain's nerve cells. Brain planning test is made to detect the existence of a number of health problems affecting the brain.
The electrical activity of the brain appears in the form of waves of a certain pattern, which vary according to the activity and movement of the patient, where the speed of electrical waves increases during waking and less during sleep, and if there is an imbalance in the pattern of electric waves, it indicates a health problem in the brain by a specialist.

How to activate brain
1- Reduce eating fast foods which contain a large amount of fat, which are harmful to the brain.
2- Eat healthy foods that contain all vitamins which is responsible for balancing the different body elements, energizing the brain and feeding it with the positive energy it needs.
3- Drink plenty of water, preferably at least eight cups a day.
4- Eat plenty of vegetables and fruits.
5- Eat healthy foods such as corn oil and olive oil.
6- Sleep for hours enough according to confirmed research and studies that the brain needs time to rest, to improve its functions .