In structure all the so called wonders of the world will pale into insignificance when compared to the brain.  If a question is asked, how do we see; most of us will answer we see through our eyes, but this is not true. There are sight centres inside the brain by which we see things. Similarly,  hearing with ears, smelling with nose, tasting with tongue, and feeling with skin- all these happen inside the brain. Brain governs our moods like laughter, anger, pain pleasure, sex, fear, every thing. Brain tells the person when he is sick and when is hungry also.

The function of human brain is often compared with the function of a super computer. But super computer cannot cope with vast informations, which a human brain does. Super computer may give signal of an impending disaster like earthquake but cannot shift itself from the premises of the disaster. But brain of a person gives the signal of a disaster and asks the person to go to a safer place. A super computer cannot laugh, cannot sing, cannot write poetry or create an art. So, human brain is more powerful than a super computer. A super computer may be switched off. But brain can’t be.

Human brain also works during sleep. When there are too many information brain selects the important ones and acts accordingly.  Suppose you want to listen to music and read at same time. You cannot do both. Reading a good novel, solving a puzzle or listening music can never be simultaneously done. You have to give priority to a subject.

As you retrieve old data from a computer, so also you can retrieve data from your memory. Suppose five years back you had an accident at a particular place, say three hundred kilometers away.  When you pass through that particular place that event flashes over your memory, and you can vividly see things.

As the brain is very vital, it is kept inside a well protected fortress called skull. The skull is half a centimeter thick at the top and thicker in the bases. Brain is bathed by an watery fluid called cerebra spinal fluid, C.S.F. in short. This fluid cushions the brain from shock. There is a blood brain barrier inside the brain which serves as a gate keeper. This gate keeper allows certain things inside brain like glucose and blocks certain things like bacteria or toxic substances. Unfortunately many poisons and alcohol pass the blood brain barrier.

The architecture of brain is like a chunk of grass. If you take a chunk of grass with soil you will see lots of grass roots. So brain is like that in a bigger scale. Each of billion nerve cells (neurons) has root like out growths called dendrites and they are connected to each other, some are connected, 60,000 times. There are 30 billion nerve cells in the brain and many dendrites like spider nets. So imagine the nature of nerves-working in the brain. Signals pass through the connections   with a speed of 340 kilometers per hour. After each signal passes, it takes 1/2000 of a second to recharge it and again ready for duties by chemical means. Neurons never touch each other, signals pass through only sparks with each firing one nerve communicate with another through chemical means.

Brain cells do not reproduce like skin cells, liver cells or blood cells or any other cells of body. If one brain cell dies, then that dies for ever. By age of forty, a person looses about thousand brain cells daily. So, as age advances, the brain cells loose weight. When enough cells are destroyed a person may loose hearing, taste or smell. That is why as age advances one person may loose attention, and it becomes difficult in his part to remember names, dates, telephone numbers of near and dear ones.

Like Lungs or kidneys, brain is a paired organ with two hemispheres. The left hemisphere controls the right side of the body and right hemisphere controls the left side of body.  In right handed person, the left hemisphere is dominant and vice versa.

The brain has earmark areas for different work. Area for hearings, seeing, tasting, smelling are different. So also past memories are stored in specific areas. So, if one part is destroyed, other specialized works are not destroyed. Specialization in brain is such perfect than other parts take lot of time to do the work of that part of brain. That is why it takes lot of time for the paralysed limbs to come back to life after a stroke.

Brain has four major diseases. They are infection, stroke, tumour and injury. Brain activity is increased by taking balanced diet, good exercises, yoga and meditation.