Big Questions In Science

Why do some people go bald?

•     There are two reasons why people may go bald. The live hair germ centres have either been permanently destroyed or they have been temporarily damaged.     

•      Temporary hair loss often occurs after a high fever, thyroid disease or tuberculosis, but it grows again in most cases after the disease is cured. Drugs, X-rays, malnutrition and some skin diseases can also cause temporary hair loss, but usually it grows again within a year.  

• Stages of female badness pattern

•          There is also a disease called alopecia areata , in which the hair falls out in patches all over the head , usually the germ centres have been injured only temporarily, and in 99% of cases the hair grows again without treatment . Baldness may occur at almost any time of life after childhood.

 

•  Permanent baldness or alopecia occurs in more than 40% of men and may affect the whole head. In women it affects the crown of the head only and never leads to complete loss of hair . Three  factors often lead to permanent baldness: heredity, age and hormone balance . There is no cure. Other causes of permanent baldness may be injuries or diseases which produce severe scarring, inborn lack of hair development and severe injuries to the hair germ centres by chemicals.

    What makes you feel dizzy?
   Dizziness most commonly occurs when a person who has been moving around with speed stops suddenly. The sensitive liquid in the inner ear, which mainly controls balance , continues to move for a time after the body has stopped .So , the surroundings appear to be still in motion. However , it only takes a few seconds for the fluid , and balance to settle.     

Dizziness

       This sensation also called vertigo , may also occur to someone looking down from a height or on board ship. Here the cause is probably not so much physical as a nervous reaction  which effects the fluid in the inner ear.