Sikh philosophy - Prohibited behavior (Wikipedia)

1. Non-logical behavior: Superstitions, or rituals which have no meaning, such as pilgrimages, fasting and bathing in rivers, gambling, worship of graves, idols or pictures, and compulsory wearing of the veil for women, are prohibited.
2. Material obsession: ("Maya") Accumulation of materials has no meaning in Sikhism. Wealth such as gold, portfolio, stocks, commodities, properties, et cetera, will all be left here on Earth when you depart. Do not get attached to them.
3. Sacrifice of creatures: Sati – Widows throwing themselves in the funeral pyre of their husbands, the act of slaughtering lambs and calves to celebrate holy occasions
4. Non-family oriented living: A Sikh is encouraged not to live as a recluse, beggar, monk, nun, celibate, or in any similar vein.
5. Worthless talk: Bragging, gossip and lying are not permitted.
6. Intoxication: The consumption of alcohol, drugs, tobacco, or other intoxicants is prohibited.
7. No priestly class: Sikhs do not have to depend on a priest for any of the functions that need to be performed.
8. Eating meat killed in a ritualistic manner (Kutha meat): Sikhs are strictly prohibited from eating meat killed in a ritualistic manner (such as halal or kosher, known as Kutha meat^[1] ), or any meat where langar is served.^[2] In some small Sikh Sects, i.e. Akhand Kirtani Jatha eating any meat is believed to be forbidden, but this is not a universally held belief.^[3] The meat eaten by Sikhs is known as Jhatka meat.
9. Having premarital or extramarital sexual relations^[4][5][6][7]

^{Source: http://en.wikipedia.org/wiki/Sikh_philosophy}

Biology - Brain: Brain Waves

When you drop a small stone in water, you see waves. Similarly our heart and our brain have wave patterns. The wave pattern of the heart is measured by ECG (electro cardiograph). The brain waves are measured by EEG (electro encephalograph).

Using the brain wave studies, scientists have discovered that our brain waves are of four types.

The brain waves also have peaks that are similar to the peaks we see in water waves. The number of times the peak appears in one second is called "cycles per second ". For example, the electricity in India is of 50 cycles per second.

• Beta (13 to 25 cycles per second)
  This brain wave indicates that your conscious mind is in control. It indicates a mental state of logical thought, analysis, and action. You are alert and awake talking, speaking, doing, solving problems, etc.
   
• Alpha (8 to 12 cycles per second)
  This brain wave indicates relaxation and meditation. It is a state of relaxed alertness good for inspiration, learning facts fast.
   
• Theta (4 to 8 cycles per second)
  Deep meditation. This is associated with life-like imagination. This is best for suggestibility and inspiration. This brain wave is dominant in children of age 2 to 5.
   
• Delta (0.5 to 4 cycles per second)
  Deep dreamless sleep. Deep relaxation.

Left brain and right brain working together

Usually the left brain and the right brain waves are independent. They reach peaks independent of each other. During meditation and deep relaxation, the left brain waves and the right brain waves happen together.

 

For both, the peaks are reached together. This is called synchronization. Scientists now believe that synchronization makes much greater mind power available. This is associated with learning large amounts of information very quickly as well as with creativity. Brain self-control

Scientists had long believed that brain activity such as brain waves and secretion of brain chemicals were beyond conscious control. But, experiments on Swami Rama of the Himalayas and on biofeedback have now changed that belief. Now it is proven that some people can control their brain waves, etc. 

Link: http://www.bibliotecapleyades.net/ciencia/ciencia_brain01.htm