Usually a person’s fingerprints do not change during the lifetime. Minor and superficial cuts that he’ll do not affect the pattern formed by the ridges that cover the skin of the fingertips. Ridges are the impressions which make fingerprints. However, extensive or deep wounds, severe burns, surgery or disease may destroy these ridges and lead to a change in fingerprint patterns. Deep wounds damage the underlying dermis of the skin and healing often leads to scar formation. Since scar tissue does not show secondary modifications such as hair, it does not show the ridge pattern either. However, these are extremely unlikely events and usually fingerprints are for life.
When you meet another person, or are introduced to him, it is polite to say ‘Namaste’ with folded hands, or extend your hand for a handshake. The handshake is the universal form of greeting in the West. However, even this simple gesture varies from country to country.
Pain is felt only when a nerve end is stimulated by a cut or injury. 
Transplanted organs are rejected because of the presence of special protein molecules present in the body of every individual. Called antibodies, these molecules can easily recognize a foreign body by a substance called antigens produced by the later.
The stomach is a muscular bag-like organ that digests food with strong acids contained in gastric juices produced by glands in the stomach lining. To protect itself from being digested along with the food, the stomach lining is coated with a thick layer of mucous produced by mucous cells. This mildly alkaline mucous secretion protects the stomach against the acidic digestive juices.
on water is 14.7 psia (pounds per square inch – absolute). This atmospheric pressure varies with the altitude. So the boiling point of water is influenced with respect to the atmospheric pressure. Perfect vacuum is ‘O’ psia. Any pressure between 14.7 psia and o-psia is ‘negtive pressure’, that is, partial vacuum. Vacuum drying takes advantage of the decrease in the boiling point of water that occurs as the pressure is lowered. This type of drying keeps the products with very low moisture content. If salt water is subjected to this negative pressure, the water will boil by taking the heat from the ambient. In case of reducing atmospheric pressure, i.e. 14.7 psia to 0.15 psia, water will start boiling at 7°C itself.
bacteria orbacterial toxins or by eating poisonous foods such as certain species of mushrooms.Molds and bacteria are responsible for microbial food poisoning. Molds grow on food (especially if they are moist). During their growing period they produce toxic substances called mycotoxins whose effect on man and animals cause mycotoxicosis. Mycatoxins remain the the food long after the mold producing them has died and can therefore be present in foods that are not visibly moldy. Some mycotoxins are stable and survive the usual conditions of cooking and processing.